Hi all,

I have a problem with my Hot Water Boiler, it makes a high pitch
screaming/ buzzing sound. I believe everything is fine as we get our
hot water for shower/ bath and for heating, but it just makes a high
pitch screaming/ buzzing sound occassionally.

I found that switching it off and then on again (after a few minutes'
wait) sometimes stops the sceaming/ buzzing noise. (But not this
evening).

Does anyone know the reason for the noise, and how to fix it?

The model of the hot water heater is Range Powermax 155 from RSA
Waterheating Limited.

Thanks

Gerard