Hi my boiler is making a very loud howling sound when on. This use to just happen on the High setting but is happening on the low setting now. If i turn the thermostat to off the sound stops. Any help would be appreciated.
Get limit stats checked/ changed as they are probably old and poor.
Boiler might be full of scale, so try introducing some patent solution inot the system water that claims to deal with this scale noise. I have no idea which is best, someone else may have a favourite.
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