Hello,
We have a Vaillant boiler as above. It produces a very loud whistling noise from start-up for about 10mins and then runs normally. It has been inspected by a few engineers and this has been an ongoing problem for quite a while. .The last engineer can solve virtually anything, but this one has him stumpted. We don't want to start throwing parts at it and Vaillant technical hadn't a clue, so any contributions will be gratefully received..
We have a Vaillant boiler as above. It produces a very loud whistling noise from start-up for about 10mins and then runs normally. It has been inspected by a few engineers and this has been an ongoing problem for quite a while. .The last engineer can solve virtually anything, but this one has him stumpted. We don't want to start throwing parts at it and Vaillant technical hadn't a clue, so any contributions will be gratefully received..