I am hoping someone may be able to shed some light on a heating problem I have.

I moved into my new home six months ago. As winter set in, I noticed an annoying problem with my heating system. The thermostat on the boiler appears to override the central heating. To explain: the room thermostat will be on but, once the boiler has reached its target temperature, will shut everything down, including the heating.

I can get the heating to switch on again only by turning the thermostat on the boiler up!

Any pointers as to what may be causing the problem would be greatly appreciated.