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I have a Lennox Pulse furnace that started making noise.

Customer Question
I have a Lennox...

I have a Lennox Pulse furnace that started making noise. (loud humming) That can be heard more outside by vent piping. Thanks, Bill,

Contractor's Assistant: Did you check the furnace's filters?

Yes, I had a repairman look at blower motor, filter and water condensate . He stayed for about an hour and did not hear anything, I hear it more at night and outside. Definately from vent. I hit the exhaust vent a month ago with my mower and it broke off. Can exhaust be going back into intake? Maybe some PVC piece is rattling in pipe or muffler?

Contractor's Assistant: Do you plan on doing the work yourself?

If its just adding PVC pipe

Submitted: 9 months ago.Category: HVAC
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Answered in 23 hours by:
12/1/2017
HVAC Technician: Phil, Mechanical Engineer replied 9 months ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,878
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, if you have concentric exhaust and intake and that broke off, then indeed you could be sucking some exhaust gas back into your intake and that would indeed cause the pulse burner to make a little additiional noise.

.

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