noisy baxi 105e

mickfos · 1 Mar 2006

We have a Baxi 105 combination boiler which is approx 18 month old and we are now getting a whine, which can be heard through out the house.
Also when the boiler is cold and the central heating kicks in, we then get a very loud whine from the boiler for a couple of mins.
It then resumes to the steady whine.
I have bled the central heating system a number of times but have got very little air out of it.
Could anyone please help.
thank you

Baxmax · 1 Mar 2006

Heat exchanger or Diverter valve.Was system flushed/inhibited.How old is the boiler ???

mickfos · 3 Mar 2006

Thanks for the reply,
The boiler is 18 months old and the system was not flushed. All the installer did was fit thermostatic valves to the radiators.
There is no divertor valve on the system, so I belive it is a heat exchanger system.

regards Michael Foster

andsam · 3 Mar 2006

Baxi have had problems with a whine commimg from the diverter valve within the boiler. There is an improved diverter available but I would suggest ringing Baxi first they may cover under warranty.

Baxmax · 3 Mar 2006

SOUNDS ABOUT RIGHT ANDSAM,PERSONALLY I HAVE ALWAYS PREFFERED MY WINE IN A GLASS NOT ON THE BOILER...

Baxmax · 3 Mar 2006

Mickfos there is a divertor valve on this boiler it diverts primary heated water to the plate heat exchanger to heat the cold main water coming into the boiler in order to give you hot water at the hot tap,basically a combi.
You say the noise is apparant on heat up {first fire} from cold,if so its more likely to be the heat x,unless there is screeching when you demand dhw at a tap.Best bet flush system/cleanse/inhibit.In other words do all the things your installer should have done and probably charged you for ...

gazthepottertonengineer · 3 Mar 2006

noise will almost certainly be from the diverter valve O'rings not sealing properly

diverter can be removed and O'rings replaced is the cheapest option

mickfos · 7 Mar 2006

Baxmax said:
Mickfos there is a divertor valve on this boiler it diverts primary heated water to the plate heat exchanger to heat the cold main water coming into the boiler in order to give you hot water at the hot tap,basically a combi.
You say the noise is apparant on heat up {first fire} from cold,if so its more likely to be the heat x,unless there is screeching when you demand dhw at a tap.Best bet flush system/cleanse/inhibit.In other words do all the things your installer should have done and probably charged you for ...

Thanks for that.
What is involved with flushing the system.
Do I need to get an expert to do this, or can I do it myself ?.
If I need to get someone to do it, can you give me any idea of the cost.

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noisy baxi 105e

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