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Plumberpro, Mechanical Engineer
Category: HVAC
Satisfied Customers: 634
Experience:  Over 20 years experience in plumbing heating and gas
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My Baxi Combi 133HE works perfectly - heats water, radiators

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My Baxi Combi 133HE works perfectly - heats water, radiators except when the demand for heat has finished, the burner shuts off etc, but the pump keeps on running - not just a few minutes as it should do, but continually!
Sounds like a faulty PCB to me - do you agree?
Plumberpro :

Hob. Mike, yes I agee

Plumberpro :

However le me just check the boiler manual to make sure that the pump overun isn't linked to another component that could be faulty , thanks

Plumberpro :

Hi , I would change the flow overheat stat first( cheaper than the board) as it appears to be linked to the pump

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