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how can I fix my Main Combi HE?

Have a main combi HE boiler. The heating is permanently on even I switch to hot water only. The heating does not switch off with the room stat it just keeps going off and on.

levellojohn
February 2013
MainMain Combi HEHeating, Home Heating SystemsBoiler Heating Hot Water
most likely a faulty diverter valve. it most likely stuck in the on postion. check the installers manual on the diverter valve picture. and have a look for leaks also disconnect the micro switch for the heating and see if it makes a diffrence

kash
February 2013

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