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Yeah that's the bad boy. It was all the gritty particles that had built up over the last couple of years.

After going through British gas where my boiler wasn't on their serviceable list I got in contact with vokera. The fault turned out to build up of silty residue from the condenser section of the boiler. This was cleaned out and seems a common issue. Boiler has had a service check and is now all...

Thanks very much for all the responses so far. Only one thing I would like to try and get my head round is if it is scaling in the heat exchanger then what is recommended to be done to mitigate the build up in the future in a soft water area.

If it was something to do with scale build up in the heat exchanger would I not be seeing a reduced flow of hot water which I am not getting.

I get water out when I open bleed valves. Flow is no different than before though.

Kettling I like that yes it's doing that. Water flow is fine for both hot and cold same as it was before this noise. Don't believe it is scaling as water is quite soft up here though could be wrong.

Hi first post here, I have a procombi ct25 boiler which has just started to fail on me. The last day it started to make a noise akin to constant boiling water. This is not the usual noise leading me to suspect that a component has failed or air has somehow got into the system. I tried...