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On the programmer, both water and heat in the Auto mode, no call for heat or water, boiler is lit and running. I agree that in this configuration that nothing should be on and I have noticed before that boiler has been running on its own this way. Could the programmer be faulty as well...

Hi, Heating started to play up on Saturday morning on first frosty cold day of the year. No neon lights on the PCB. At that time, both heat and water called for. Had a heating engineer out who suspected was PCB. However, I noticed that when no call for heat or water, neon lights all on...