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My heating is driving me nuts . When I first start the system its fine but after about half an hour it goes onto central heating only and stays there until the cylinder stat is turned up or the isolator is opened .I took the 3 position valve head off and put a new sync motor on which made no...

I can't find my multi meter at the moment but I have found that when the heating sticks on ie the rads are getting hot water when the room stat and cylinder stat are both satisfied . it is possible to restore the system by turning up the cylinder stat a bit .I previously had to turn off the...

I have a newish CH system with one 3 way valve .It sometimes becomes stuck on central heating .ie. the leaver on the 3 way valve goes all the way down and stays there ,the boiler continues to run and the rads get hot and the system won't shut down on the room stat .Switching off the isolator is...