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Central Heating valve problem.
I have a Horstmann timer controlling a fully pumped sytem with a
mid-position valve. If HW and CH are selected and running, then switching CH off does not cause the valve to move even at the end of the on/off cycle. The only solution is to disconnect the mains from the system sometime during the off period when the spring moves the valve to the correct HW-only position. Is this a wiring error on my system or a problem with this type of valve?. Can anyone help with a solution? Alan Booth |
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