I have the Vaillant 282 and the hot water works fine, but only some of the radiators are getting hot. We have bled the rads and checked the pressure on the boiler which is at the required 1.5 mark. Can anyone suggest what might be preventing all the rads from heating up - is this a faulty pump???

Jen, March 2008

possibly a faulty pump could be at fault,but other rad could be blocked up with sludge

paul, March 2008