After checking the boiler stat, my first choice is;Try flushing the system, it might be sludged up, and not circulating, the boiler is getting to temp before the rads, use Fernox or similar, this is not uncommon.
Norman
September 2007
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.