Recent content by Dr Spock

You were correct about probably being to do with the mixture. I sent the GW Tech Dept an email, and received the following response: " The problem you have is fairly common with these type of appliances. I think you have an issue with your gas/air mixture which is slightly out, resulting in...

Thanks for the suggestions. It doesn't sound like bearings, and why would the noise disappear after a few seconds ? The mixture settings I assume are factory set. There's no mention of any adjustment in the Installation info.

Yes. it sounds like an air movement problem. Could the fan be coming on too fast or too soon, before the combustion is properly underway ? What could cause this ?

Hi I have a GW 18hxi, installed in a conventional open system in my 3 bedroom house. The boiler is in what used to be the garage, with the flue going vertical through the flat roof, with termination kit. It's been fitted about a year. The boiler emits what can only be described as a...