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Ok, thanks for the advice so far. Just one thing more though; do I wait for it to do it again - may be then as a hard fault -, or call out a service engineer now and hope that (as suggested) they'll replace all the electronics speculatively? Thanks Dave B.

I have considered this. They have quoted £275 inc VAT for parts included one time repair (except for the heat exchanger and expansion vessel) or £312 for the same but covering a 12 month period. My concern is that with it being an intermittent fault that when the Vaillant service engineer...

My Vaillant TurboMax Plus 837 combi boiler has developed an intermittent fault whereby the flue fan fails to start, so the boiler's controller eventually ends up in the S33 "Check air/flue system" state. Unlike other posts on this subject whereby the fault was with the air flue switch, the...