problems with a combi boiler Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[undertaker]

I am having a few problems with a worcester/ bosch heatslave 20/25 combi boiler. It is losing pressure,making a banging noise when hot water tap is switched on, ch stays on and sometimes radiators are too hot to touch.

[htg engineer]

Sounds like it's overheating, and the pressure relief valve could be releasing the excess pressure to outside.

Have you noticed the Pressure relief discharge pipe releasing any water ?

Is the boiler auto-air vent open, all radiators heat to the top ?(no air in system)

Get a heating engineer out to repair. Could be a faulty thermostat or sensor.