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Baxi 80E heating is on constantly even with timer switch in off position?

Central heating pump is constantly running. Boiler lights up intermittently, runs for few seconds, then flame cuts off. But pump still keeps running, although timer switch is in the off position. No problem with flow of hot water to taps.
Steve T, June 2008
sounds like it is a microswitch on the dhw flow switch sticking

Kieran, July 2008
link Click here to see other fixes for Baxi 80E.