I have a problem with my heating system since I changed the programmer.
The system is a 28-year old open vented gravity HW system, with a
pumped CH system as well.

My Randall 3060 packed up over Christmas - Bug number 1 started moving
instead of switching the heating on, until it jammed up against bug
number 2.

Anyway, I decided to replace it with a more modern 5/2 digital
programmer - a trip to B&Q Warehouse revealed that a Sunvic Select
207XL was a suitable replacement unit for the Randall 3060.

Sunvic fitting guide listed the wired terminals from the Randall's MK3
plate that should be disconnected and reconnected to the Sunivc
wallplate - Basically, I ended up with three neutral wires to terminal
N, a live wire to terminal L, and a HW and CH on wire to terminals 3 &
4. Dip switches on the programmer were set to Gravity, 5/2 day
programming and three time periods.

This left me with some wires left over - a red/black combo that were
wired into the same terminal on the Randall, and three earth wires. For
each set, I have taped them together with insulating tape and bent them
out of the way for now.

However, I can only get the hot water to come on. This warms up two of
the three upstairs radiators as well (I think I have an antigraviy
valve missing in my system!), but downstairs is very frosty.

Pump is not spinning up, from what I can see. Clearly it is not wired
right, but having followed the Sunvic instructions I am unsure what to
do next.

Does anyone else have experience with this set up?