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Fitted a replacement programmer and everything works as it should. Thanks again.

Thank you very much stem for your help in solving this "mystery". I will replace the programmer as you suggest - and remember to check the amparage of my fuses in future.

I disconnected terminal 4 and the heating didn't come on at all - irrespective of the programmer settings.

Thanks. I will disconnect wire at terminal 4 and report back.

Thanks for your helpful reply. I will visibly double check again the wiring for errors but I think it might be the programmer which could have shorted when I incorrectly rewired the 3 way port valve head recently. The circuit breaker on the main fuse box tripped as I had mistakenly connected a...

Can somebody please advise why my Drayton digital room thermostat (Digistat) still switches on the boiler i.e. "calls for heat" despite my programmer's CH setting ( Drayton LP522) being set to "off". It seems to be either faulty wiring or a faulty programmer. In all other respects the system...