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Changed thermistors (both), still the same pump runs although heat not called for. Also in summer mode (H/W only) open hot tap and c/h pump on boiler runs??? boiler does not ignite.

Thanks for that sludg, all makes sense. The only problem I am having is finding the part. as no-one seems to know what part no or whatever for this model. emailed ravenheat but no reply so far.......... will keep trying, good job we kept our good old open fire, its scorching hot in here!!!!!!

Ive noticed that the vent pipe is weeping near to the top and this is leaking onto or near the ch thermosister, perhaps this could be contributuing towards a problem......... And yes the presure is 1.5 although it had dropped to 1.0. I will try your suggestion and let you know. I think...

My Ravenheat combi LS 80? has suddenly stopped firing up, no hot water even on summer setting, and no central heating. checked and cleaned electrodes, still nothing although I have noticed that the c/h/ pump is operative even though room thermostat off. ANY IDEAS (19 months old)