Boiler not switching off

24 Feb 2008
Reaction score
United Kingdom
I've got a Worcester 240 combi which used to switch off when it reached a certain temp. Now it just runs permanently until the timer switches it off. Is this a thermostat issue? And is it easy to change?
Sponsored Links
Have you tried turning the room thermostat up and down to see if it clicks ON and OFF and if so does this have any effect on the boiler at all?

If you are confident with electrical repairs it's easy to replace but note that it carries mains voltage.
I don't have any room thermostats so I presume that boiler has an internal thermostat as it used to switch off and on.
Sponsored Links
surely it must be going off when the overheat stat trips, otherwise it would just boil, turn into steam and burst heat exchanger

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local