New natural gas heating system

[BugHunter]

They were playing with combustion analyzers to lessen the noise, never really went away especially when it is cold outside.

If you're curious, remove it and open it before it goes away. I'm betting the fan cage is damaged and running out of round, and that's what is making the noise. Mine wouldn't run more than a few hours that way before everything would quit. The screeching was unreal. It just melted the fan and case together. They have safeties (barometric sensors) that can tell if it's working, and if it isn't, exhaust gas is left inside the house which is a no-no. So it shuts down.

 

[clifish]

mine only makes the noise on firing then it goes away, it has never shut the unit down due to it.......as far as I know...lol