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my central heating pump does not turn itself off when boiler turns off?

we have a grunfos central heating pump that does not always turn itself off after the boiler has been turned off .will sometimes run on for hours or until we physically turn off its main supply

paul milton
May 2008
GrundfosHeating, Home Heating SystemsBoiler Heating System Grundfos
If the pump is wired from the boiler it might be the pump overrun stat or PCB

dat
May 2008

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Grundfos Pump Running On? - Fixes & Advice