Central Heating Pump


Postby jazzman » Fri Oct 03, 2008 11:37 am

The pump kicks in when heating / hot water are not requested and boiler does not light, just the pump runs usually in the middle of the night

I then have to shut / switch off whole system for a period of time to stop it. :(
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Postby plumbbob » Fri Oct 03, 2008 9:56 pm

You haven't really given any information to help diagnose a fault, but my first choice would be to examine the three port valve for correct operation. That is if you have one.
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Postby screech » Sat Oct 04, 2008 11:38 pm

maybe it's the boiler pcb faulty running it's anti pump seize mode. some boilers will run the pump every 24 hours if the boiler hasn't operated. if the pcb is faulty it might not recognise that the boiler has been on so operates the pump at the same time every night. i've had this problem on a potterton suprima before.
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Postby jazzman » Sat Oct 11, 2008 1:53 pm

Its a Worcester Bosch Condensing Boiler 3 years old, they (my service provider) say there is a faulty circuit board, so some relays are not opening/closing properly, they are to replace that next week so we shall see if that sorts it.
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