hot water fine but when I put heating on the boiler fires up but the motorised valve just fitted on boiler does not open up heating. when the electrics are removed from vavle the boiler still lights and heats to 80degrees the pin on valve appears not to come down far enough to open diverter valve.
take out motorize valve turn on boiler with heating on press pin on divert valve keep press see it heating side flow pipe is getting warm ,look like pin is jamming up ,change whole body of divert valve
