Lennox G26Q3-75-1 thumping noise before induction motor startsthumps in the night
Posted 05 December 2011 - 04:47 PM
I have a Lennox G26Q3-75-1 furnace. Just before the inducton motor starts, there is a loud noise (thumb) that seems to come from inside the walls.
At first I thought it was the house moving (getting cold out, figured the house will groan a bit), however this has been a constant thing right before the furnace kicks on.
I've sat next to the furnace listening for the thump..no luck. When upstairs I can hear the thumb quite clearly. And again, only happens as the furnace is about to cycle.
Posted 05 December 2011 - 05:15 PM
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Posted 05 December 2011 - 11:19 PM
Edited by applianceman18007260692, 05 December 2011 - 11:21 PM.
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Posted 07 December 2011 - 09:53 AM
Thermal expansion/contraction does play a part of this, however, I don't believe all of the thumping is from expansion. Some of the thumps come right before the inducer motor comes on. As I said, I've sat next to the furnace thinking it may be a switch or something, and there is no unseemly noise there when it starts up.
Again, thanks for your replies.
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