Boiler only turns off with the system fuse Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[scampthefirst]

I have a Triancogas wall mounted boiler that will only switch off with the system fuse, I have changed the timer switch, checked that the room stat is working, nothing is different. I have vague recollections of changing the thermostat in the boiler at a previous address (about 30 years ago) could this be the same problem?

[htg engineer]

Motorised valve / actuator ?

Does the system have one ?

htg