The pump appears to be operating when central heating is not on?
The water pump seems to be operating even when neither the hot water nor the central heating system is calling for heat. There are three levels marked on the pump and when either of them are selected the pump works except where the lever is just below the level II mark.
The pump is a GRUNDOS SELECTRIC , Type 15-50 about 4 years old.
sounds like the end switch is stuck on a motorised zone valve, 2 port valves are common try tapping the valve and if the switch drops off pump will stop
higgy
October 2012
It's common in boiler pump keep going until cool down to set tenp
ltd
October 2012
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