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Mend Baxi Solo 3 PFL Boiler Heating Circulation

The water pump runs all day?

Baxi Solo 3 PFL

The timers are set for morning and evening but the pump runs all day and all night, It is circulating warm water I assume being heated by the hot tank. I thought it over ran for a period until the water and boiler were cooled sufficiently.
Anyone suggest which component is most likely to be faulty

Dave King
January 2008
faulty pump overrun, but its built into the pcb, so a new pcb will be required

Paul the gas man
January 2008

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