I have a Gloworm condensing boiler, 1 year old.
Recent problems has resulted in a new pump fitted in the last 3 months and a powerflush due to sludge in system and loud banging etc. Apparently boiler installer didn't flush out system correctly.
Powerflush done this week and heating much improved. However when boiler first turned on, there is an almighty loud whistling sound, like a kettle whistle. This lasts for 5 minutes or so or until I turn boiler off and then on again. Noise outside from flue is even louder, so guess it has something to do with force of steam being pushed out of flue. Once whistling stops, it does not come back until boiler turned off and re started at another time.
Pump was left on high, level 3, and I have turned this down to 2 so do not know if this will have anything to do with it.
Any help appreciated.
Recent problems has resulted in a new pump fitted in the last 3 months and a powerflush due to sludge in system and loud banging etc. Apparently boiler installer didn't flush out system correctly.
Powerflush done this week and heating much improved. However when boiler first turned on, there is an almighty loud whistling sound, like a kettle whistle. This lasts for 5 minutes or so or until I turn boiler off and then on again. Noise outside from flue is even louder, so guess it has something to do with force of steam being pushed out of flue. Once whistling stops, it does not come back until boiler turned off and re started at another time.
Pump was left on high, level 3, and I have turned this down to 2 so do not know if this will have anything to do with it.
Any help appreciated.