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Hi Chris thanks for reply, looking at what you have said, i've noticed as soon as the heating turns off the pump does stop running so could be this overrun thermostat, i'll replace and see what happens. Many Thanks

Any advise gratefully accepted :idea: I have a Myson Apollo boiler, a Wilo Gold 50 pump, Honeywell mid position valve and Danfoss timer, recently i had to change the Honeywell valve and ever since when the heating turns off when up to temp on the room stat there is an almighty water rushing...