Can any one please advise me on the following problem. My central heating system has worked fine for 13 years or more and yesterday the radiators started getting hot when the room thermostat was turned way down. Had that same problem 2 years ago and changed the pump over run thermostat and its worked fine up till yesterday. Checked all wiring and all is OK took off the room stat and frost stat still same problem. My only other thought is that the Y valve is sticking open to allow the radiators to come on when calling for hot water. Any ideas please.
Potterton Prima B
- Thread starter Engineersparks
- Start date
DIYnot Local
Staff member
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