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Boys, I've cracked it. It was the hint of a jammed motorised valve - many thanks - that made me check , and sure enough one was jammed open. It would seem that that sends a signal back to the programmer to keep the system running. (The previous time it was jammed shut.) A good...

There are two motorised valves. If any one of them stuck, how would that keep the system running? I have had them stick before, when I renewed the motor, but it didn't give me the present problem

Are you speaking about motorised valves on the pipes, for hot water and central heating?

Dear all, Sorry for the lack of information. The controller is a Drayton Lifestyle L522. I have in front of me the circuit diagram for the Boiler Control Box Terminal Strip, which has 15 terminals, some connected to the controller - or progrmmer as it is called here - some to the...

I am assured by a good and experienced friend that it must be either the gas valve stuck or the "permanent live" . It can't be the gas valve as it does cut off periodically, so it must be the permanent live. It seems to be situated in the box at the boiler thermostat. What does it look like, and...

The pump runs on and the boiler stays alight

The boiler is an old upright e-type.

My central heating system continues to run after the controller says it is off. I am told that this is due to a faulty "permanent live". Does anyone know how to fix this?