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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Posted to alt.home.repair,sci.electronics.repair
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Hi,
Here in England, I have a Beko "DE 2541 FX" slimline dishwasher that stopped working properly... just before Christmas. When I press the button to start the cycle, the machine drains and then fills as normal and then -- instead of kicking into that rhythmic swishing sound -- it just sits there in dead silence. After 15 minutes it might fill again, and if left might fill yet again after another while. But it never kicks into wash mode. It does this even on the simple no-heat, pre-wash setting. I checked the heater, it looks perfectly fine and is not open-circuit. I checked the thermistor, fine, it correctly changes resistance when it's in hot water. Everything looks pretty much perfect, after all it's only three years old. The main circulation pump looks pristine, and so does its capacitor. But when I measured with a multi-meter across the terminals of the pump (insulated crocodile clips!), I discovered that at no time does it receive any voltage. I decided to replace the controller card (only £30) and today I find it still has exactly the same problem with the new controller installed. Argh! So what is the real culprit? Can anyone help? I know there is a circulation sensor, a thermistor, and various door safety and overfill doodads but I am not sure what exactly would cause this particular problem. I would be grateful for anyone's experience and expertise: I don't want to be defeated by this thing! With many thanks, Sandy P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. (I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. And some of the symbols I don't immediately recognize, or they're just "circles".) I would be most grateful if someone took an informed guess as to what the components must be. I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. Anyway, I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Many thanks again. |
#2
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Posted to alt.home.repair,sci.electronics.repair
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I assume the unit uses an electronic controller, and not an
electromechanical one. If it /is/ the latter, check the timer switch. If it's the former, it could just be a bad wire or connection between the controller and the pump. |
#3
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Posted to sci.electronics.repair
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Usenet Inscribed thus:
Hi, Here in England, I have a Beko "DE 2541 FX" slimline dishwasher that stopped working properly... just before Christmas. When I press the button to start the cycle, the machine drains and then fills as normal and then -- instead of kicking into that rhythmic swishing sound -- it just sits there in dead silence. After 15 minutes it might fill again, and if left might fill yet again after another while. But it never kicks into wash mode. It does this even on the simple no-heat, pre-wash setting. I checked the heater, it looks perfectly fine and is not open-circuit. I checked the thermistor, fine, it correctly changes resistance when it's in hot water. Everything looks pretty much perfect, after all it's only three years old. The main circulation pump looks pristine, and so does its capacitor. But when I measured with a multi-meter across the terminals of the pump (insulated crocodile clips!), I discovered that at no time does it receive any voltage. I decided to replace the controller card (only £30) and today I find it still has exactly the same problem with the new controller installed. Argh! So what is the real culprit? Can anyone help? I know there is a circulation sensor, a thermistor, and various door safety and overfill doodads but I am not sure what exactly would cause this particular problem. I would be grateful for anyone's experience and expertise: I don't want to be defeated by this thing! With many thanks, Sandy P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. (I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. And some of the symbols I don't immediately recognize, or they're just "circles".) I would be most grateful if someone took an informed guess as to what the components must be. I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. Anyway, I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Many thanks again. Find & check switch 6. -- Best Regards: Baron. |
#4
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Posted to sci.electronics.repair,alt.home.repair
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Usenet wrote:
Baron wrote: P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. (I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. And some of the symbols I don't immediately recognize, or they're just "circles".) I would be most grateful if someone took an informed guess as to what the components must be. I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. Anyway, I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Many thanks again. Find & check switch 6. Not quite sure which 6 you mean, from this unix-like reply! Surely not the double switch labelled 06 over on the far left. You must mean the switchy hatty little symbol at the lower left of the diagram labelled '6. Are you thinking, like me, that this is this the anti-flood cutoff device? There's a round grey plastic thingy located on the bottom plate of my machine, and has a round white polystyrene float visible in this plastic device. A bit like an thick oversized communion wafer, if anyone remembers such things. The flood sensor seemed OK to me, dry too. My guess is that what you describe above is a float switch and is the "6" symbol in the next to the bottom line at the left side (as you said above). A possible problem is that it is not closing and the motor won't run because the circuit does not think there is enough water. Might be there is not enough water, or the float switch has a problem. My guess is that is what "check switch 6" is about. [My dishwasher fills partly on a time cycle, and a malfunctioning pressure reducer prevented a complete fill.] The few dishwashers in the US that I have played with have a single pump motor (probably on pin 2 as you guess). The motor is used for drain also - the water is pumped out. That does not seem to be consistent with your meter measurement. If there is a second motor my guess is it is pin 13 - could be a fan for drying. My guess is that the rectangles with diagonal slashes (like pin 3,4,5) are solenoids such as might be attached to fill or drain valves (which might be pins 3,5). Pins 12 & 16 might be switches, like a door-open switch. If pin 11 has a heater, the lower symbol may be a temperature limit switch. Tracing wires should tell you what the symbols are. You might want to try newsgroup uk.d-i-y -- bud-- |
#5
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Posted to sci.electronics.repair,alt.home.repair
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Baron wrote:
P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. (I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. And some of the symbols I don't immediately recognize, or they're just "circles".) I would be most grateful if someone took an informed guess as to what the components must be. I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. Anyway, I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Many thanks again. Find & check switch 6. Not quite sure which 6 you mean, from this unix-like reply! Surely not the double switch labelled 06 over on the far left. You must mean the switchy hatty little symbol at the lower left of the diagram labelled '6. Are you thinking, like me, that this is this the anti-flood cutoff device? There's a round grey plastic thingy located on the bottom plate of my machine, and has a round white polystyrene float visible in this plastic device. A bit like an thick oversized communion wafer, if anyone remembers such things. The flood sensor seemed OK to me, dry too. To complete my uploading of the timer control circuit diagram for the Beko "DE 2541 FX" slimline dishwasher, here's what I guess are the components attached to the PCB pins (along the top of the diagram) taken from an earlier post of mine. Counting the pins from left to right, here's what I *think* is attached to each: pin 1 : main power button switch pin 2 : motor with capacitor? dunno. pin 3 : pump motor pin 4 : motor (without pump?? a "load"?) pin 5 : pump motor pins 8-9 : God knows what pin 11 : fuse, water-heater, normally-on microswitch pin 12 : a normally-off safety microswitch (?) pins 13-14: ??? (mystery circle!) pins 15-16: a normally-off safety microswitch (?) pins 17-18: ??? (can't find this symbol anywhere!) pins 19-21: Thermistor circuit Mysteries: At the low left of the diagram, what is the symbol marked '6? In the middle of the diagram, is the thing labeled &2 a two way switch? I think if I knew these things, it would help to connect (in my understanding) the diagram and the actual wires and devices I see dotted around the machine. I would be very grateful for any informed guesses and suggestions from people. Thanks for everyone's replies. I'm very encouraged by the quick and sure response. Encouraged enough to put on my boiler suit and disconnect the damn machine again, and go checking for continuity and **** until I get the damn thing working again. I will follow up when I do. It's always gratifying to come across such posts. Many thanks again everyone, Sandy |
#6
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Posted to sci.electronics.repair,alt.home.repair
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On Jan 19, 8:34*am, Usenet wrote:
Baron wrote: P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. *(I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. *And some of the symbols I don't immediately recognize, or they're just "circles".) *I would be most grateful if someone took an informed guess as to what the components must be. *I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. *Anyway, I've scanned and uploaded the diagram he * * * * *http://i49.tinypic.com/28r1thw.jpg Many thanks again. Find & check switch 6. * * *Not quite sure which 6 you mean, from this unix-like reply! *Surely not the double switch labelled 06 over on the far left. *You must mean the switchy hatty little symbol at the lower left of the diagram labelled '6. *Are you thinking, like me, that this is this the anti-flood cutoff device? *There's a round grey plastic thingy located on the bottom plate of my machine, and has a round white polystyrene float visible in this plastic device. *A bit like an thick oversized communion wafer, if anyone remembers such things. *The flood sensor seemed OK to me, dry too. * * *To complete my uploading of the timer control circuit diagram for the Beko "DE 2541 FX" slimline dishwasher, here's what I guess are the components attached to the PCB pins (along the top of the diagram) taken from an earlier post of mine. *Counting the pins from left to right, here's what I *think* is attached to each: pin *1 * *: main power button switch pin *2 * *: motor with capacitor? dunno. pin *3 * *: pump motor pin *4 * *: motor (without pump?? a "load"?) pin *5 * *: pump motor pins 8-9 *: God knows what pin *11 * : fuse, water-heater, normally-on microswitch pin *12 * : a normally-off safety microswitch (?) pins 13-14: ??? (mystery circle!) pins 15-16: a normally-off safety microswitch (?) pins 17-18: ??? (can't find this symbol anywhere!) pins 19-21: Thermistor circuit Mysteries: At the low left of the diagram, what is the symbol marked '6? In the middle of the diagram, is the thing labeled &2 a two way switch? I think if I knew these things, it would help to connect (in my understanding) the diagram and the actual wires and devices I see dotted around the machine. *I would be very grateful for any informed guesses and suggestions from people. * * *Thanks for everyone's replies. *I'm very encouraged by the quick and sure response. *Encouraged enough to put on my boiler suit and disconnect the damn machine again, and go checking for continuity and **** until I get the damn thing working again. *I will follow up when I do. *It's always gratifying to come across such posts. Many thanks again everyone, Sandy- Hide quoted text - - Show quoted text - Have you contacted whomever installed/sold/ever serviced the dishwasher? You are informed enough to be able to hold an intelligent discussion with someone familiar with the product and maybe they could give you some tips on your particular model. |
#7
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Posted to sci.electronics.repair
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Usenet Inscribed thus:
Baron wrote: P.S. - I have obtained the circuit diagram of my Beko dishwasher, the logic of which was designed by the Turkish company 'Arcelik'. (I don't understand it very well, chiefly because the diagram's labels got scrambled at some stage. And some of the symbols I don't immediately recognize, or they're just "circles".) I would be most grateful if someone took an informed guess as to what the components must be. I could then relate the diagram to my actual dishwasher's control board, components, wiring and mechanisms. Anyway, I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Many thanks again. Find & check switch 6. Not quite sure which 6 you mean, from this unix-like reply! Surely not the double switch labelled 06 over on the far left. You must mean the switchy hatty little symbol at the lower left of the diagram labelled '6. Yes ! Thats the one. Are you thinking, like me, that this is this the anti-flood cutoff device? There's a round grey plastic thingy located on the bottom plate of my machine, and has a round white polystyrene float visible in this plastic device. A bit like an thick oversized communion wafer, if anyone remembers such things. The flood sensor seemed OK to me, dry too. If that switch is OC the main motor will not run. The other side is via the timer. 6th contact from left marked (1) There is also a cutout marked 7/ that should be checked. It may be a manual reset. To complete my uploading of the timer control circuit diagram for the Beko "DE 2541 FX" slimline dishwasher, here's what I guess are the components attached to the PCB pins (along the top of the diagram) taken from an earlier post of mine. Counting the pins from left to right, here's what I *think* is attached to each: pin 1 : main power button switch pin 2 : motor with capacitor? dunno. pin 3 : pump motor pin 4 : motor (without pump?? a "load"?) pin 5 : pump motor pins 8-9 : God knows what pin 11 : fuse, water-heater, normally-on microswitch pin 12 : a normally-off safety microswitch (?) pins 13-14: ??? (mystery circle!) pins 15-16: a normally-off safety microswitch (?) pins 17-18: ??? (can't find this symbol anywhere!) pins 19-21: Thermistor circuit Mysteries: At the low left of the diagram, what is the symbol marked '6? In the middle of the diagram, is the thing labeled &2 a two way switch? I think if I knew these things, it would help to connect (in my understanding) the diagram and the actual wires and devices I see dotted around the machine. I would be very grateful for any informed guesses and suggestions from people. Thanks for everyone's replies. I'm very encouraged by the quick and sure response. Encouraged enough to put on my boiler suit and disconnect the damn machine again, and go checking for continuity and **** until I get the damn thing working again. I will follow up when I do. It's always gratifying to come across such posts. Many thanks again everyone, Sandy -- Best Regards: Baron. |
#8
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Hi!
I think you will find that you have a relay in your dishwasher with burnt contacts. This will prevent the pump from ever getting power. If you have an electronic set of controls, there ought to be some relays somewhere. Since you mentioned that replacing the controller board did not resolve the problem, I would say that there is a separate power control and distribution unit elsewhere in the unit. You should locate this part and see what's inside or on it. It's less likely but possible that there are fuses protecting each major circuit in the unit. One of these may have blown. Nuisance fuse blowing is possible but unlikely. If there is a fuse and it blew, there is likely a fault in the circuit. If you do end up finding that a burnt relay is the problem, you can sometimes repair it by carefully levering the cover off the relay and cleaning the burned contacts. Unfortunately, opening relays can involve violence, and sometimes you just can't do it without destroying the relay itself. The wiring in your dishwasher should be pretty straightforward (but this will vary depending upon how many functions it has). It should be possible to trace out each wire and determine what it does. William |
#9
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Baron wrote:
Usenet Inscribed thus: I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Find & check switch 6. If that switch is OC the main motor will not run. The other side is via the timer. 6th contact from left marked (1) There is also a cutout marked 7/ that should be checked. It may be a manual reset. Just to get things straight: what kind of switch is this switch '6? It's normally closed, yes? Do you think -- by it's position in the diagram -- it's the flood protection switch? Where would cutout 7/ be, physically? Is it on the pump itself? Switch '6 also controls the things immediately to the right of the main circulation pump, labelled :9, '5, and 59. These look like solenoid-type thingies, the ones with "triangle propellers" look maybe like valves. Are they solenoid type things? The circle labelled '30 I'm pretty sure is the drain pump (in Europe apparently it's usual to have two separate pumps). This pump still works. What is your guess for the thing labelled )0 off contact 13 from the left? It must be acting as some kind of sensor, I'm thinking, by it's position on the right of the diagram. I've checked for continuity and there's no breaks in the wires that I can find. However, during operation of a dishwasher cycle, no voltage is ever given (by the brand new replacement controller!) to the main circulation pump, as measured with a multi-meter. Therefore -- it looks to me -- like the controller is expecting a signal to proceed, which it never receives. What is the symbol marked 17&, over towards the right? It looks a bit like a Christmas cracker, so I'm hoping it's some fusey cut-out thing. I would dearly love to know its meaning. Having had a good look at the innards of my dishwasher, I'm not intimidated by it anymore. They're really very straightforward things. I can feel it's not far from working. It's really frustrating right now, but I now feel I *can* get it working again. ... and of course, if it stops me having to wash up by hand every day, that would be WONDERFUL!!! Regards, Sandy |
#10
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William R. Walsh wrote:
I think you will find that you have a relay in your dishwasher with burnt contacts. This will prevent the pump from ever getting power. If you have an electronic set of controls, there ought to be some relays somewhere. Since you mentioned that replacing the controller board did not resolve the problem, I would say that there is a separate power control and distribution unit elsewhere in the unit. You should locate this part and see what's inside or on it. It's less likely but possible that there are fuses protecting each major circuit in the unit. One of these may have blown. Nuisance fuse blowing is possible but unlikely. If there is a fuse and it blew, there is likely a fault in the circuit. If you do end up finding that a burnt relay is the problem, you can sometimes repair it by carefully levering the cover off the relay and cleaning the burned contacts. Unfortunately, opening relays can involve violence, and sometimes you just can't do it without destroying the relay itself. The wiring in your dishwasher should be pretty straightforward (but this will vary depending upon how many functions it has). It should be possible to trace out each wire and determine what it does. I'm pretty sure my dishwasher has just the one PCB. I've just spent the evening with the dishwasher on its side, checking for continuity and tracing the wiring, and locating and inspecting water tubes and devices. And of course, drinking cups of tea and eating biscuits (cookies?). No wires broken, alas so the mystery is still at large. I checked the dishwasher's operation again -- the controller definitely never sends voltage to the main pump. But every 5 minutes or so it fills a little bit more, I watched it do this for 40 minutes, and then got fed up and had to press the button to make it drain and stop the cycle. By the way, I've uploaded the manufacturer's circuit diagram for my dishwasher at: http://i49.tinypic.com/28r1thw.jpg Also, here's a picture of the one and only PCB in my Beko "DE 2541 FX" slimline dishwasher, at: http://i49.tinypic.com/30bn60i.jpg (...Are the black and blue blocks on the left, in lieu of the relays?) But it is very interesting what you said about burnt relays... ...On the day the dishwasher went wonky, that morning we had just had our electricity reconnected to the mains grid after a week of being without electricity. (They were logging nearby in the forest.) When our supply was reconnected, actually *three* things went wrong that day. 1) A long-life bulb stopped working. 2) My Bosch jigsaw stopped working. 3) The dishwasher worked in an odd way for several "clearing the backlog" washes -- there were longer and longer pauses between the filling/heating, and waiting for the swishing sound of dishes being cleaned. On the last successful go, the swishing suddenly started an hour after starting a run. (It startled me, in fact!) After three things had independently gone wrong, I measured the voltage of the mains (supplied from step-down transformer from overhead wires that snakes across our forest). The normal domestic mains voltage in England is 230-240 volts AC. That afternoon ours read 255 volts, which slowly came down after a several days to 240, and then back down to it's usual 235-ish. While tinkering this evening with the dishwasher, I was thinking that (apart from the possibility of blown fuses/relays) it had to be EITHER a bad sensor -- an input to the timer/controller -- that is not performing, OR that a process is not happening (because of a solenoid etc.) that ultimately leads to an undesirable reading from a sensor. That's to say "If no voltage ever gets sent to the motor by the brand new replacement controller, then the fault is because the dishwasher programme must be waiting for an OK signal from somewhere in the system that never arrives." This happens on the simple 15 minute "pre-wash" setting (no heating of the water is involved, so that clears Mr. Thermostat from the list of suspects). Because of the unusual voltages on the day the dishwasher died, I think it most very probably must be a high-voltage actuator (a solenoid or a fuse) that's gone, and probably not a low-voltage sensor. I would very much appreciate anything you have to say. Regards, Sandy |
#11
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On Jan 20, 9:00*pm, Usenet wrote:
William R. Walsh wrote: I think you will find that you have a relay in your dishwasher with burnt contacts. This will prevent the pump from ever getting power. If you have an electronic set of controls, there ought to be some relays somewhere. Since you mentioned that replacing the controller board did not resolve the problem, I would say that there is a separate power control and distribution unit elsewhere in the unit. You should locate this part and see what's inside or on it. It's less likely but possible that there are fuses protecting each major circuit in the unit. One of these may have blown. Nuisance fuse blowing is possible but unlikely. If there is a fuse and it blew, there is likely a fault in the circuit. If you do end up finding that a burnt relay is the problem, you can sometimes repair it by carefully levering the cover off the relay and cleaning the burned contacts. Unfortunately, opening relays can involve violence, and sometimes you just can't do it without destroying the relay itself. The wiring in your dishwasher should be pretty straightforward (but this will vary depending upon how many functions it has). It should be possible to trace out each wire and determine what it does. * * *I'm pretty sure my dishwasher has just the one PCB. *I've just spent the evening with the dishwasher on its side, checking for continuity and tracing the wiring, and locating and inspecting water tubes and devices. *And of course, drinking cups of tea and eating biscuits (cookies?). *No wires broken, alas so the mystery is still at large. *I checked the dishwasher's operation again -- the controller definitely never sends voltage to the main pump. *But every 5 minutes or so it fills a little bit more, I watched it do this for 40 minutes, and then got fed up and had to press the button to make it drain and stop the cycle. * * *By the way, I've uploaded the manufacturer's circuit diagram for my dishwasher at:http://i49.tinypic.com/28r1thw.jpg * * *Also, here's a picture of the one and only PCB in my Beko "DE 2541 FX" slimline dishwasher, at:http://i49.tinypic.com/30bn60i.jpg * * *(...Are the black and blue blocks on the left, in lieu of the relays?) * * *But it is very interesting what you said about burnt relays... * * *...On the day the dishwasher went wonky, that morning we had just had our electricity reconnected to the mains grid after a week of being without electricity. *(They were logging nearby in the forest.) *When our supply was reconnected, actually *three* things went wrong that day. 1) *A long-life bulb stopped working. 2) *My Bosch jigsaw stopped working. 3) *The dishwasher worked in an odd way for several "clearing the backlog" washes -- there were longer and longer pauses between the filling/heating, and waiting for the swishing sound of dishes being cleaned. *On the last successful go, the swishing suddenly started an hour after starting a run. *(It startled me, in fact!) * * *After three things had independently gone wrong, I measured the voltage of the mains (supplied from step-down transformer from overhead wires that snakes across our forest). *The normal domestic mains voltage in England is 230-240 volts AC. *That afternoon ours read 255 volts, which slowly came down after a several days to 240, and then back down to it's usual 235-ish. * * *While tinkering this evening with the dishwasher, I was thinking that (apart from the possibility of blown fuses/relays) it had to be EITHER a bad sensor -- an input to the timer/controller -- that is not performing, OR that a process is not happening (because of a solenoid etc.) that ultimately leads to an undesirable reading from a sensor. That's to say "If no voltage ever gets sent to the motor by the brand new replacement controller, then the fault is because the dishwasher programme must be waiting for an OK signal from somewhere in the system that never arrives." * * *This happens on the simple 15 minute "pre-wash" setting (no heating of the water is involved, so that clears Mr. Thermostat from the list of suspects). * * *Because of the unusual voltages on the day the dishwasher died, I think it most very probably must be a high-voltage actuator (a solenoid or a fuse) that's gone, and probably not a low-voltage sensor. * * *I would very much appreciate anything you have to say. Regards, Sandy- Hide quoted text - - Show quoted text - It could well be that the over-voltage has fried some of the electronics. That's why I always (#times in 45 years) get a dishwasher with a mechanical timer. NOt as many choices, but a LOT less that can go wrong. |
#12
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Usenet Inscribed thus:
Baron wrote: Usenet Inscribed thus: I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Find & check switch 6. If that switch is OC the main motor will not run. The other side is via the timer. 6th contact from left marked (1) There is also a cutout marked 7/ that should be checked. It may be a manual reset. Just to get things straight: what kind of switch is this switch '6? It's normally closed, yes? Do you think -- by it's position in the diagram -- it's the flood protection switch? Yes its normally closed. Where would cutout 7/ be, physically? Is it on the pump itself? Yes, probably, since its a thermal cutout. Looking at the diagram its shown directly above the motor. Its normally closed. Switch '6 also controls the things immediately to the right of the main circulation pump, labelled :9, '5, and 59. These look like solenoid-type thingies, the ones with "triangle propellers" look maybe like valves. Are they solenoid type things? 9 & 59 are probably solenoid water valves. I'm not at all sure what 5 is. The circle labelled '30 I'm pretty sure is the drain pump (in Europe apparently it's usual to have two separate pumps). This pump still works. It that case it rules out switch 6. Since if 6 was open the pump wouldn't run. What is your guess for the thing labelled )0 off contact 13 from the left? It must be acting as some kind of sensor, I'm thinking, by it's position on the right of the diagram. I've checked for continuity and there's no breaks in the wires that I can find. However, during operation of a dishwasher cycle, no voltage is ever given (by the brand new replacement controller!) to the main circulation pump, as measured with a multi-meter. Therefore -- it looks to me -- like the controller is expecting a signal to proceed, which it never receives. One of those, possibly the one marked )0 is the timer drive motor. 366 could be the water level sensor. What is the symbol marked 17&, over towards the right? It looks a bit like a Christmas cracker, so I'm hoping it's some fusey cut-out thing. I would dearly love to know its meaning. I think +)7 is the heater and 17& the soap dispenser. Having had a good look at the innards of my dishwasher, I'm not intimidated by it anymore. They're really very straightforward things. I can feel it's not far from working. It's really frustrating right now, but I now feel I *can* get it working again. ... and of course, if it stops me having to wash up by hand every day, that would be WONDERFUL!!! Regards, Sandy The basic operation is that of a rotary switch driven by a motor. Once a program has been chosen, the switch drive motor normally runs continuously. A solenoid is often used to cause the switch drive motor to step the rotary switch on to the next position depending upon some criteria being met. This could be :- Fill level, Temperature, Time. Usually the fill level has to be reached and water shut off before the main pump motor is allowed to start. Often the main pump motor and heater are not allowed to be both switched on at the same time. Then when water temperature has been reached the soap dispenser is activated. Then a timed wash cycle commences. Water is drained. Refilled and rinse aid injected and a further wash cycle starts. This is followed by another heat cycle designed to create a high temperature, and short wash before fully emptying. This is designed to dry the contents and leave a polish. All the above will vary depending upon the chosen program and is not any more than a general description of operation. Being on the spot and able to see what wire goes to which component is a great advantage. :-) -- Best Regards: Baron. |
#13
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Sandy,
I'm in the UK ! Drop me an Email. -- Best Regards: Baron. |
#14
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On Jan 21, 2:53*pm, Baron wrote:
Sandy, I'm in the UK ! Drop me an Email. -- Best Regards: * * * * * * * * * * *Baron. Gee - Your English is so good you almost sound AmericanG. |
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#16
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In article ,
Baron wrote: Usenet Inscribed thus: Baron wrote: Usenet Inscribed thus: I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Find & check switch 6. If that switch is OC the main motor will not run. The other side is via the timer. 6th contact from left marked (1) There is also a cutout marked 7/ that should be checked. It may be a manual reset. Just to get things straight: what kind of switch is this switch '6? It's normally closed, yes? Do you think -- by it's position in the diagram -- it's the flood protection switch? Yes its normally closed. Where would cutout 7/ be, physically? Is it on the pump itself? Yes, probably, since its a thermal cutout. Looking at the diagram its shown directly above the motor. Its normally closed. Switch '6 also controls the things immediately to the right of the main circulation pump, labelled :9, '5, and 59. These look like solenoid-type thingies, the ones with "triangle propellers" look maybe like valves. Are they solenoid type things? 9 & 59 are probably solenoid water valves. I'm not at all sure what 5 is. The circle labelled '30 I'm pretty sure is the drain pump (in Europe apparently it's usual to have two separate pumps). This pump still works. It that case it rules out switch 6. Since if 6 was open the pump wouldn't run. What is your guess for the thing labelled )0 off contact 13 from the left? It must be acting as some kind of sensor, I'm thinking, by it's position on the right of the diagram. I've checked for continuity and there's no breaks in the wires that I can find. However, during operation of a dishwasher cycle, no voltage is ever given (by the brand new replacement controller!) to the main circulation pump, as measured with a multi-meter. Therefore -- it looks to me -- like the controller is expecting a signal to proceed, which it never receives. One of those, possibly the one marked )0 is the timer drive motor. 366 could be the water level sensor. What is the symbol marked 17&, over towards the right? It looks a bit like a Christmas cracker, so I'm hoping it's some fusey cut-out thing. I would dearly love to know its meaning. I think +)7 is the heater and 17& the soap dispenser. Having had a good look at the innards of my dishwasher, I'm not intimidated by it anymore. They're really very straightforward things. I can feel it's not far from working. It's really frustrating right now, but I now feel I *can* get it working again. ... and of course, if it stops me having to wash up by hand every day, that would be WONDERFUL!!! Regards, Sandy The basic operation is that of a rotary switch driven by a motor. Once a program has been chosen, the switch drive motor normally runs continuously. A solenoid is often used to cause the switch drive motor to step the rotary switch on to the next position depending upon some criteria being met. This could be :- Fill level, Temperature, Time. Usually the fill level has to be reached and water shut off before the main pump motor is allowed to start. Often the main pump motor and heater are not allowed to be both switched on at the same time. Then when water temperature has been reached the soap dispenser is activated. Then a timed wash cycle commences. Water is drained. Refilled and rinse aid injected and a further wash cycle starts. This is followed by another heat cycle designed to create a high temperature, and short wash before fully emptying. This is designed to dry the contents and leave a polish. All the above will vary depending upon the chosen program and is not any more than a general description of operation. Being on the spot and able to see what wire goes to which component is a great advantage. :-) Is this indeed a rotary switch model, rather than one with all electronic controls and a fancy touch panel? If it's the former, it sounds possible to me that the rotary switch is at fault--either the little timer motor for it isn't turning it (because of motor or gear train failure), or some of the contacts are not operating properly. The first failure mode could be tested by manually turning the switch by small bits and seeing if the dishwasher goes through the proper stages of washing that it's currently missing. The latter problem would require a timing diagram of the switch to diagnose easily; there's a chance there may be one pasted into the machine somewhere, or associated with the schematic. It does seem rather odd to me that, if it's a rotary switch model, the various wires to the switch aren't shown on the schematic. On the other hand, it is a slightly strange schematic to begin with, so I guess it wouldn't be a complete shock. -- Andrew Erickson "He is no fool who gives what he cannot keep to gain that which he cannot lose." -- Jim Elliot |
#17
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On 22/01/2010 04:14, Andrew Erickson wrote:
In , wrote: Usenet Inscribed thus: Baron wrote: Usenet Inscribed thus: I've scanned and uploaded the diagram he http://i49.tinypic.com/28r1thw.jpg Find& check switch 6. If that switch is OC the main motor will not run. The other side is via the timer. 6th contact from left marked (1) There is also a cutout marked 7/ that should be checked. It may be a manual reset. Just to get things straight: what kind of switch is this switch '6? It's normally closed, yes? Do you think -- by it's position in the diagram -- it's the flood protection switch? Yes its normally closed. Where would cutout 7/ be, physically? Is it on the pump itself? Yes, probably, since its a thermal cutout. Looking at the diagram its shown directly above the motor. Its normally closed. Switch '6 also controls the things immediately to the right of the main circulation pump, labelled :9, '5, and 59. These look like solenoid-type thingies, the ones with "triangle propellers" look maybe like valves. Are they solenoid type things? 9& 59 are probably solenoid water valves. I'm not at all sure what 5 is. The circle labelled '30 I'm pretty sure is the drain pump (in Europe apparently it's usual to have two separate pumps). This pump still works. It that case it rules out switch 6. Since if 6 was open the pump wouldn't run. What is your guess for the thing labelled )0 off contact 13 from the left? It must be acting as some kind of sensor, I'm thinking, by it's position on the right of the diagram. I've checked for continuity and there's no breaks in the wires that I can find. However, during operation of a dishwasher cycle, no voltage is ever given (by the brand new replacement controller!) to the main circulation pump, as measured with a multi-meter. Therefore -- it looks to me -- like the controller is expecting a signal to proceed, which it never receives. One of those, possibly the one marked )0 is the timer drive motor. 366 could be the water level sensor. What is the symbol marked 17&, over towards the right? It looks a bit like a Christmas cracker, so I'm hoping it's some fusey cut-out thing. I would dearly love to know its meaning. I think +)7 is the heater and 17& the soap dispenser. Having had a good look at the innards of my dishwasher, I'm not intimidated by it anymore. They're really very straightforward things. I can feel it's not far from working. It's really frustrating right now, but I now feel I *can* get it working again. ... and of course, if it stops me having to wash up by hand every day, that would be WONDERFUL!!! Regards, Sandy The basic operation is that of a rotary switch driven by a motor. Once a program has been chosen, the switch drive motor normally runs continuously. A solenoid is often used to cause the switch drive motor to step the rotary switch on to the next position depending upon some criteria being met. This could be :- Fill level, Temperature, Time. Usually the fill level has to be reached and water shut off before the main pump motor is allowed to start. Often the main pump motor and heater are not allowed to be both switched on at the same time. Then when water temperature has been reached the soap dispenser is activated. Then a timed wash cycle commences. Water is drained. Refilled and rinse aid injected and a further wash cycle starts. This is followed by another heat cycle designed to create a high temperature, and short wash before fully emptying. This is designed to dry the contents and leave a polish. All the above will vary depending upon the chosen program and is not any more than a general description of operation. Being on the spot and able to see what wire goes to which component is a great advantage. :-) Is this indeed a rotary switch model, rather than one with all electronic controls and a fancy touch panel? If it's the former, it sounds possible to me that the rotary switch is at fault--either the little timer motor for it isn't turning it (because of motor or gear train failure), or some of the contacts are not operating properly. The first failure mode could be tested by manually turning the switch by small bits and seeing if the dishwasher goes through the proper stages of washing that it's currently missing. The latter problem would require a timing diagram of the switch to diagnose easily; there's a chance there may be one pasted into the machine somewhere, or associated with the schematic. It does seem rather odd to me that, if it's a rotary switch model, the various wires to the switch aren't shown on the schematic. On the other hand, it is a slightly strange schematic to begin with, so I guess it wouldn't be a complete shock. Couple of possibilities not so far mentioned I think. On one or two models of d/w an open circuit heating element will prevent the main pump motor from running. Also, failures of the wiring loom where it flexes as it passes between the door and main body of the machine are common enough. On most machines, clicking the timer switch on by hand should step the machine through it`s program. usually starting with:- drain, fill, fill + main motor, drain, etc. Ron(UK) |
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Hi!
*I'm pretty sure my dishwasher has just the one PCB. Fair enough. I can't view your circuit diagram from where I am now, but I will look at it as soon as time allows and see if I have any further thoughts. *And of course, drinking cups of tea and eating biscuits (cookies?). That's always a good troubleshooting practice! *...On the day the dishwasher went wonky, that morning we had just had our electricity reconnected to the mains grid after a week of being without electricity. A-ha! Now that's a good point to consider. When power is first restored, it's not always stable. The voltage may be high, low or "wobbly". That's hard on electrical equipment. Since you mentioned a lightbulb failing and the line voltage being at 255 volts (instead of the more normal 240), it is obvious that your line voltage was high. This puts stress on everything that is plugged in and operating at the time. Simpler devices are likely to take it better, at least to a point. (Had your lightbulb survived, it would have been a good example of this theory.) I'm afraid that it is likely your dishwasher was damaged and not just put into a confused state. The damage probably took place within a few minutes. Since you've replaced the controller board, I am in agreement that you need to check the sensors and actuators that the control board works with to get the dishes washed. It's very possible that more damage is lurking in the shadows. One must consider that the power supply in the dishwasher may not have been able to maintain proper voltage regulation, causing high or incorrect voltages to be present in the unit. This could lead to damaged sensors, solenoids or whatever else there is in the unit. Careful testing of each part should be performed--hopefully the schematic you have shows appropriate characteristics for each part. Otherwise you will have to make some educated guesses and careful examinations. I'll try to get a look at the schematic you have posted and see if that gives me any ideas. William |
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In article , Usenet
writes I would be grateful for anyone's experience and expertise: I don't want to be defeated by this thing! Terrible diagram. Can't think how that was meant to help. Check switch 06 carefully. One side may be broken. WITH PLUG OUT! There is some kind of fusible link (7A) above motor 630. Check that. The switch &2 looks like it may be me kind of heat selector switch. Is it? Check the link 7). A fuse? What's "0 DLQ%RDLG" ? A hybrid PCB potted in epoxy? You said the dishwasher was cheap. Afraid you now know why. Arçelik is a big factory in Turkey. Any "brand" of white goods you buy in Europe now comes from there. -- (\__/) (='.'=) Bunny says Windows 7 is Vi$ta reloaded. (")_(") http://imgs.xkcd.com/comics/windows_7.png |
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In article , Usenet
writes Not quite sure which 6 you mean, from this unix-like reply! Surely not the double switch labelled 06 over on the far left. Oh yus. Especially if you're in the habit (as I am) of opening the machine mid-cycle to chuck something else in. The machine filling, pausing, filling suggests it doesn't know where the water level is. -- (\__/) (='.'=) Bunny says Windows 7 is Vi$ta reloaded. (")_(") http://imgs.xkcd.com/comics/windows_7.png |
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In article , Usenet
writes Also, here's a picture of the one and only PCB in my Beko "DE 2541 FX" slimline dishwasher, at: http://i49.tinypic.com/30bn60i.jpg (...Are the black and blue blocks on the left, in lieu of the relays?) No, they form a mains conditioner circuit, to stop rubbish generated by the motor(s) filtering back into the mains. Switch '6 looks like some sort of breaker (thermal breaker?) Do triple check that. -- (\__/) (='.'=) Bunny says Windows 7 is Vi$ta reloaded. (")_(") http://imgs.xkcd.com/comics/windows_7.png |
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Mike Tomlinson wrote:
You said the dishwasher was cheap. Afraid you now know why. Arçelik is a big factory in Turkey. Any "brand" of white goods you buy in Europe now comes from there. Buying that dishwasher, we had in mind maintaining and repairing it ourselves. It's actually just right for us for that reason. Very simple, accessible, with standard parts at the right price. Ideally, we would have got a Chinese one, if it was available. Anyway, it turns out that the problem wasn't the dishwasher's fault at all -- it was the self-tapping dishwasher "faucet" under the sink, that got clogged with rusty stuff over the past few years. It was barely a trickle! Turned off the mains, unscrewed it, cleaned it out and put it back again. Full power again! I agree that that circuit diagram is not very helpful. Apart from everything being carefully scrambled and having no relationship to the physical layout, I think it must be for the top-end Beko model. Several features are missing from my bottom-of-the-range model. I discovered (from Beko UK) that the Beko DE2541F slimline dishwasher model only has a flow-meter for the water level control. That, and the flood protection device, I suppose. The flow meter is a lovely elegant little device, and you can hear it counting, by attaching an audible continuity tester to two easily accessible contacts on the flow meter. As of this evening, the water fills properly now. I'm guessing now, but when the incoming water pressure was only at a trickle, because the controller recognized that it was filling too slowly, the machine went into an unusual mode: filling for 15 seconds every five minutes, testing for the right water pressure. It never sent any mains voltage to the main pump. Now that the water pressure is back, the controller does send mains voltage to the pump at the right moment. (It was *wonderful* at long last, to see the voltmeter -- attached by insulated crocodile clips to the motor leads -- jump from 0 to 240 volts!) I *still* have a problem though! When the pump is meant to kick in, it doesn't, it merely "hums". My guess is that a month of not working, being tipped over on it's side, and having water drained from it, etc, has seized up the pump. Does anyone know... what do do you turn in the pump or induction motor in an attempt to unstick it? Here's a very amateur picture of my machine's pump: http://i50.tinypic.com/2w6b58o.jpg With kind regards, Sandy |
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On Jan 29, 3:09*pm, Usenet wrote:
* * *I *still* have a problem though! *When the pump is meant to kick in, it doesn't, it merely "hums". *My guess is that a month of not working, being tipped over on it's side, and having water drained from it, etc, has seized up the pump. * * *Does anyone know... what do do you turn in the pump or induction motor in an attempt to unstick it? *Here's a very amateur picture of my machine's pump: * * * * *http://i50.tinypic.com/2w6b58o.jpg Make sure the pump CAN turn i.e. try to turn the impeller. There might be a foreign object , something displaced from flipping the unit etc. The crud in the water supply may be connected to recent freeze/ thaw. Breaks loose all kinds of scale and rust. Good luck |
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Some of the Pump motors have a slot on the back of the shaft, that you can
try turn (back and forth) with a screwdriver to free it up. If it has a fan on the back, you can pull off the protective cover and try turn the fan by hand (just don't undo the long screws that hold the motor together!!!). P "malua mada!" wrote in message ... On Jan 29, 3:09 pm, Usenet wrote: I *still* have a problem though! When the pump is meant to kick in, it doesn't, it merely "hums". My guess is that a month of not working, being tipped over on it's side, and having water drained from it, etc, has seized up the pump. Does anyone know... what do do you turn in the pump or induction motor in an attempt to unstick it? Here's a very amateur picture of my machine's pump: http://i50.tinypic.com/2w6b58o.jpg Make sure the pump CAN turn i.e. try to turn the impeller. There might be a foreign object , something displaced from flipping the unit etc. The crud in the water supply may be connected to recent freeze/ thaw. Breaks loose all kinds of scale and rust. Good luck --- news://freenews.netfront.net/ - complaints: --- |
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malua mada! wrote:
On Jan 29, 3:09 pm, Usenet wrote: I *still* have a problem though! When the pump is meant to kick in, it doesn't, it merely "hums". My guess is that a month of not working, being tipped over on it's side, and having water drained from it, etc, has seized up the pump. Does anyone know... what do do you turn in the pump or induction motor in an attempt to unstick it? Here's a very amateur picture of my machine's pump: http://i50.tinypic.com/2w6b58o.jpg Make sure the pump CAN turn i.e. try to turn the impeller. There might be a foreign object , something displaced from flipping the unit etc. The crud in the water supply may be connected to recent freeze/ thaw. Breaks loose all kinds of scale and rust. Good luck What a ******* pump I have installed in my machine! The plastic pump "auricle" attached to the single-phase induction motor is designed to snap into position -- at the factory -- with plastic "snappy" fastenings. But it's also designed so you have to *break* the snappy things, and hence the auricle, if you try and remove it from the motor. And when the auricle is in place, you can't access all the screw/bolts that hold the motor together. A ******* pump. The cooling fan blades are located at the back end of the motor, almost up against the back of the machine, where there's a metal plate holding a concrete ingot counter-weight (for when the front door is lowered), the inlet and outlet hoses, and the mains lead and anti-interference filter device. However, without undoing *everything* attached and entirely removing the back plate, one can unfasten the plate's screws and then pull back on it enough to see the back of the motor, and see the grey aluminium of the cooling blades at the back of the rotor. There are twelve blades on my cooling fan (I marked one with red felt tip and counted). Using a *thin* wooden chopstick, I could push the rotor one cooling blade at a time. It's quite stiff, certainly not like a free spinning bicycle wheel, like I thought it might be. I must have pushed the rotor completely around about 20 or 30 times by now, in both directions. One direction *feels* slightly easier than the other, but this may be because of the radial asymmetry of the blades. Is this how it's meant to feel, when you push the cooling blades around? The resistance is constant all the way around, so maybe this is normal... ...All advice welcome! Now I have to go do the washing up by hand, again... Many thanks, Sandy (P.S. At least the concrete ingot isn't made of tungsten.) |
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Usenet wrote:
Is this how it's meant to feel, when you push the cooling blades around? The resistance is constant all the way around, so maybe this is normal... ...All advice welcome! Dear Usenet, The dishwasher is operating normally again! I screwed the back plate back on, and connected the dishwasher up again to the water input and output. I ran it on the 15 minute pre-wash no heat cycle, fine. Then a 30 minute, 35 degree heater cycle with three changes of water, fine. The rotating arms took a while to clear themselves of little dried cloggy bits, but at the end they were going round like they always have. Swishing again! What a journey I feel I've been, through! It so happened that there wasn't anything wrong with the dishwasher per se; the fault in my case was the slowly gunked-up water supply all along. But it has been incredibly worth it -- taking off the panels, seeing the workings, testing with the multimeter, and looking over the whole works. Now the dishwasher, washing machine, power wash, and eh even the power drill, and jigsaw, and anything else, are not mysterious black boxes anymore! - A note about Haynes' "The Dishwasher Manual" by Graham Dixon: This book leaves much to be desired. It is not up to the standard of the world famous car manuals upon which Haynes' reputation rests. OK, the Haynes label gave me the initial encouragement to make me think I could repair my dishwasher, but beyond pictures of actual sub-components (most of which come from Dixon's earlier "The Washing Machine Manual"), the book hasn't been much help. More of a hindrance really. To be honest, the book seems not even half finished. The index of only several dozen entries doesn't fill a single page. Many of the diagrams have no labels and are not given a reference number. Repeated photographs of the same component, but with different comments, are seemingly there to bemuse the reader and help pad out the book. There are many infuriating chapters of one, or one and a half patronizing pages. The flow charts (speaking as a programmer myself) -- which are meant to help organize complexity -- are instead there to make the simple seem more complex, are all badly titled, unlabelled, completely moronic and waste yet more pages. And here's another what for: the chapter on pumps and motors is all about the goddamed potted physics, and the pros and cons of various approaches to motor design. No mention of how easily they can seize up, or how to go about unsticking them. There's a corporate engineering drawing of a "generic rotor" with cooling blades floating in space, but without anything else, no context! Where's the explanation on how to test if the motor's working, in situ? Or about taking care when manipulating big hose clips, or lubricating the inside lip of the hose with a smear of washing up liquid when putting it back on, of NOT using grease, which will corrode the rubber, or checking out the auricle's side exit first? I hope someone in the near future writes a *real* Dishwasher Repair and Maintenance Manual. These are, after all, increasingly the times when we're going to badly need one. With kind regards and best wishes to all, Sandy |
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