Y plan wiring problems

Hi
I have repalced a faulty honeywell mid pos valve and during installation a red wire came out so i traced back and put it in where i thought it should go and everything seemed to work well until customer called saying heating comes on when it wants and doesnt shut off

the wiring all goes back to airing cupboard and is crammed inside a single socket patress box so its hard to locate which wire goes where im going back today and maybe re-wire it into a proper wiring center but was wondering if you nice chaps had a tip finding which wire is which. I was thinking of maybe removing each wire from their terminals in turn and joining them at one end then checking them for continuity with multimeter at other end
Thanks in advance
(sorry for long post )

from what you say I imagine the prog is remote from the airing cupboard.
your plan of testing is a sound idea although you should be able to id. the room 'stat cable (1 core connected to white of valve), the boiler will be connected to the orange from valve, the prog wire(s) will connect to room and cyl 'stats. just think it through logically then double check with a meter.

twgas said:

from what you say I imagine the prog is remote from the airing cupboard.
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Click to expand...

correct

good advice, thankyou