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Yes, I might try replacing the programmer (see my Edit). Will pass on if this gives me any success.

If the sequence of the process is: Spur live to programmer > switch live programmer (ON) to thermostat > switch live thermostat (ON) to motorised valve > switch live to MV to boiler > boiler on/heating. The fact that I am able to turn the heating on with the thermostat switched live (programmer...

Sorry, bit of a rookie with plumbing/heating (hence the post!) - where would I find this? What's likely to have caused this change, from simply changing the thermostat? Faulty wiring?

Hi CBW, Boiler is a Potterton Performa System 12e. Thermostat is Myson MRT1. Timer-programmer Myson 2MEP 2c. Hasn't been an issue before with the same combination. As mentioned, recently changed the thermostat (due to discolouration; not faulty) like-for-like. This is the first time I've...

Hi all, Long time follower of the forum; first time poster! I noticed recently that when my central heating is OFF (in other words, turned off at the control module [where you programme days/times for auto start etc.]), that the boiler still kicks into life, when I set temperature on my...