I had the above combi boiler installed in October 2009 and it is working perfectly providing heat & hot water as required. However it has developed a dull clunk when running on low power ie when hot tap is only turned on low or heating is running slowly to keep set tempearature. When boiler is running on full power ie hot tap opened fully or heating coming to raise temperature several degrees. there are no clunking sounds.
Does anyone have any idea what this might be or is it normal? I have not called Worcester yet as boiler is working perfectly, apart from the dull clunk?
Does anyone have any idea what this might be or is it normal? I have not called Worcester yet as boiler is working perfectly, apart from the dull clunk?