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Thanks glasgowgas, incredibly quick reponse! but no pump overrun stat mentioned on the wiring diagram. Any ideas?

My Stanley Brandon (twin burner) water circulating pump overruns by about three - four hours after the boiler is turned off. I assume that a limited overrun is normal to cool the boiler, but is four hours required or is there a timer or stat fault, and if so can it be adjusted back to a...