DIY Doctor

Air in my central heating

Postby bechensfeld » Sun Sep 28, 2008 9:30 am

A volume of air bubbles around the gas-fired (Potterton Profile 50e with
individual stats on each radiator) and it won't bleed out of the rads or the escape value at the tank. 2 plumbers have suggested I fire boiler on max temp. turn on one rad only and bleed it but has made no difference. Header tank is fine (water is rusty coloured but we are in a sandstone area which may cause that) so is there anything I can do before draining and flushing the whole system? Plumbers say this can take many hours which they have to charge for just to watch and wait. Fair enough but I would like to leave this to the last resort if possible.
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Simply Build It

Postby screech » Thu Oct 02, 2008 11:37 pm

best way to clear air is to stop/start the pump a few times and not letting the boiler fire
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Postby Steve the gas » Fri Oct 03, 2008 4:33 am


If you feel able drain it down and refill a couple of times -- see if it improves, but research how to do it first of course.

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Postby htg engineer » Fri Oct 03, 2008 8:35 am

How do you there's air in the system, is it not the pipes/radiator valves making a noise ?

Normally venting the pump and radiators would clear the air.

Are all the radiators heating - if they are then there's unlikely to be much air in the system.

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