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Took PCB out, and 2 of the 3 joints on the pot were dry (tapping the CH control was obviously making the circuit temporarily). Took pot off, resoldered the pot on, reassembled PCB to boiler and everything now lovely jubbly. BDG

Thank you Tony, I have already replaced the ch sensor recently so I think that is OK. I will check the resistance on the pot but turning the CH control to position "11" and tapping it caused the boiler to fire, but the flow pipe didn't seem very hot so i touched the knob again (ooh er missus)...

First post, so be gentle with me! DHW no probs. CH-Pump starts up, fan runs, boiler will not fire up. My belief that the CH control (stat/potentiometer?) isn't working/generating a heating required signal. Any further checks to confirm/disprove my theory above? It would appear to be a...