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Very loud induced draft furnace

I have a 20 year old Lennox Pulse. It started to make an odd noise so I removed the panel over top of the induced draft motor while it was running. (I out it back on, tightly, of course) Now the motor growls at freakishly high volume. I had a repair guy in and he thinks its fine.

I just can't believe that it goes from not sounding like a lawn mower to sounding like a lawn mower and there's nothing I can do about it.

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  • engineer09 Feb 27, 2009

    We have a new Lennox G43UF36B-70 70,000 btu input furnace (92% eff.) installed June 2008 in Columbus, Ohio area. During the heating season, the induced draft motor, when it starts up and continues to run during a heat cycle, creates a low frequency vibration. This can be heard at the furnace location (basement) and in rooms upstairs (single floor home). It is annoying, and after that motor shuts off, the furnace continues to run acceptably quiet. If the refrigerator in the kitchen also is running while the induce draft motor runs, there is a beat frequency vibration that you can hear being generated. That goes away when the induced draft motor shuts off.



    The dealer/installer has replaced the motor twice with a Lennox sent replacement, but it continues to be the same problem. The dealer cannot come up with an answer. I don't think this should be characteristic of the furnace operation.



    I have not seen this problem with another energy efficient furnace installed at another home. It is a Goodman GKS90703BX that has about the same size induced draft motor and exhaust vent piping connection as our Lennox. The furnace is very quiet even when the induced draft motor is running, and no noticeable vibration at the furnace or in other rooms.



    Before our warranty is up, I would like to know if there is a way to know if this is a faulty furnace, or just what causes the Lennox to operate this way. Should I insist that Lennox (or the dealer) show me another home installation of this same furnace to see if it is the same or similar problem?



    Thanks for any suggestions.

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If it's a pulse furnace most were built with what's called a flapper valve and it is in need of replacement. If 20 years old it also needs to be checked for heat exchanger damage. This will need to be done by trained HVAC tech. There is no way to see inside exchanger on this system and needs to be done on table testing. This furnace at one time had a problem with heat exchangers and Lennox subcontracted this out to a company that did the liners wrong. Customers had no way of knowing there was a split in the heat exchanger until it was too late. And yes there was a warrning sent out to all people who owned one to have it checked. I CAN'T even remember the last time I saw a pulse furnace after that. I've been in the HVAC field for 30 years now. Hope this helped you.

Posted on Nov 27, 2012

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When you tighted it it very well could have done damage to the motor or you could have it off kilter 1 of the 2

Posted on Feb 06, 2009

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