problems with a combi boiler

Postby undertaker » Mon Mar 10, 2008 9:49 pm

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.
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Simply Build It

Postby htg engineer » Tue Mar 11, 2008 9:11 am

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.
htg engineer
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