I have a 2 year old combi boiler which seems to have 2 faults.
Firstly when you turn on the hot taps the rads get hot and secondly the rads seem to heat up on there own???

Rob, April 2008

Hot water is running luke warm, following increasing the pressure Radiators are running hot

Jin, December 2008

First problem, the diverter valve is stuck letting the hot water circulate to the rads when the boiler is fired for dhw.

Second problem, rads heating on their own, wow now that is an efficient system..must get one...what boiler did you say it is?

When you say rads heating on their own, what do you mean?
that the boiler is firing without a heat demand?

T, April 2008