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Sorry. Typing on phone is always rubbish. Should read mid position valve mpv . Not MPS or mpg

Think I have a MPS problem,. Radiators came on for no good reason yesterday, full blast. I have CH on on thermostat controlled. Thermostat was set correctly and clicks when turned. Does not turn Ch off. At the same time the hot water does not fire up the boiler. Again thermostat on hw tank...