Potterton promax 24 HE boiler

24 May 2005
Reaction score
United Kingdom
I've installed a new potterton promax 24 HE condensing boiler only a few months ago as part of the existing open vented system which worked fine before the old boiler packed in. After a little while ( may be 3 weeks)every time the heating is switched on, after a few minutes there is a whining noise from the boiler. I thought that it may be the pump. I then installed a new circulating pump (myson)- set at speed 1. BUT THE PROBLEM STILL PERSISTS! Any remedial suggestions will be appreciated. :confused:
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Failure to flush and add inhibitor to the
system will invalidate the appliance warranty.

straight out of the mi's

no mention in your post :confused:
how did you commission it and set up the air / gas ratio correctly?
with his nose no smell of gas must be alright as far as pump speed is concerned turn it up 1 is too low for a he boiler try looking at the fan for the whine and give it some cheese to shut it up
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surely Kev, lack of inhibitor should not cause that whining noise. However the system was thoroughly flushed. :confused:
Hi ollski, system was commissioned as per manufacturer's instructions ( except adding inhibitor as I still need to drain system to add new radiator).
Did not see any instruction or requirement to set air/gas ratio. Anyway why is it necessary and how is it done?
even as a potterton engineer we dont mess about with that as a digtal manometer isnt accurate enough and you would need specialist tools when ever we get problems like that we simply replace gas valve :!:
sounds like it could be fan though althogh this is a rare problem :?:
not at all :LOL: combustion doors coming loose happens all the time only took them 2 years to work out they needed to put washers on screws :LOL:
gasthepottertonengineer, any suggestions as to what I may attempt in the famous process of elimination? Mind you, I have already changed the pump, checked again, noise is definitely from the boiler. Lack of inhibitor can't cause this to a practically new boiler, can it? Apart from the noise, it seems to function well. PLEASE HELP!:confused:
The original poster seems very slow to post his CORGI number!

Perhaps he is not registered?

Tony Glazier

DIYnot Local

Staff member

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