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As long as there is power the hot water light on the motorised valve stays on. If I run the heating the pump will not stop running, even when the heating light on the motorised valave is not lit. To stop the heating pump running I have to switch off all of the power, it then stays off on restart...

I have one MPE322, is there some way that I can test it?

I have a Potterton Prima 50B for my hot water & heating. When the controller is set for the water and heating to be on it works OK and controls off the room and cylinder thermostats. When the controller is set for the water/heating to be off the boiler keeps running and the water gets very hot...