I would appreciate some help on a new gargling voice coming from my HVAC furnace (first time using this season - this didn't happen last year).

As shown in picture, there are 2 small tubes coming out of the air handler going into a kind of 'overflow' box (gray one mounted to the unit) which then overflows into the condensation pump. There is a very strange gargling voice coming from these tubes/ gray box, I'm thinking there should not be water in this as it is like trying to pull air inside from it. Is this normal? What could be the issue? The main pump is working fine and draining all water automatically. Condensation tubes from furnace air handler Updated the picture to show full picture

  • Where does the white PVC pipe go?
    – JACK
    Oct 19, 2022 at 12:38
  • Are you certain the sound is coming from that grey funnel? Is it blocked up at all? Maybe some spiders moved in and built a web in there, partially blocking it?
    – FreeMan
    Oct 19, 2022 at 12:43
  • That just circles back to the condensation pump. I'm uploading a picture of the full thing in OP. Thanks for your reply!
    – tipsytopsy
    Oct 19, 2022 at 12:44
  • @FreeMan - the noise is not from the gray funnel.. it is coming from the black tubes submerged in the condensation water and some bubbles coming out of the tubes.
    – tipsytopsy
    Oct 19, 2022 at 12:48
  • 1
    So it looks like it was a 'new season' kink. I sucked out all water from the gray overflow box and started again, as expected it started dripping condensation and filled up the gray box - which then normally overflows to the pump box. No more bubbles and no more noise. The tubes stay in water and no gargling sound.. I guess I just incorrectly thought these were 'air flow' tubes and not water/ condensation tubes.
    – tipsytopsy
    Oct 19, 2022 at 13:31


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.