Boiler not shutting down when roomstat breaks.

[DaveyD]

Hi,

Its a standard Glow worm boiler (fully pumped open vented system) all runs ok, but when the roomstat is turned down, the boiler is still turning on and off all the time.

Does anyone have any ideas/pointers of where to start looking?

Any help would be really appreciated.

Thanks,
Dave

 

[45yearsagasman]

Deleted. Obviously not that urgent.