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Weil McLain whistle

I have a WM Ultra 3 installed in 2012. Customer complains about a high pitch whistling. I've pulled apart the supply & exhaust [ 3" PVC ] & ran the boiler... its not the fan, I think. Is it possible or probable that the boiler circulator is pushing too much FPS...velocity I mean ? This is coming back to bite me. Not sure what to do.


  • RobG
    RobG Member Posts: 1,850
    Did it always do this? Have you checked the gas pressure and done a combustion analysis?
  • Tim McElwain
    Tim McElwain Member Posts: 4,487
    Make sure your condensate lines are free and clean. When was this last cleaned and maintained? Plugged condensate causes combustion air flow problems and I have seen them whistle and hum from poor air movement.