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Thanks - appears to be all good now!! Who would have guessed preheat was the fault? :)

Hey thanks for your suggestion - it appears to have worked!!

Hello, my Valliant ecotec pro 24 boiler randomly switches itself on and off at night but does not fire up. Sounds like the pump is running. I have no fault codes. Summer mode is active (5.31) and the selector dial with timer/on/off is in 'off' mode. Is this normal for it to switch on at night...