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Old 10-22-2012, 08:01 PM   #1
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Lennox G26Q3-75-1 Furnace does not fire up


The furnace fires up when you turn it on, but does not fire up in subsequent cycles. Need to turn it off and on again for it to fire up.

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Old 10-22-2012, 08:18 PM   #2
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Lennox G26Q3-75-1 Furnace does not fire up


Is there a flashing led diagnostic light on an electronic board that is visable through a viewing port in the door?
There should be a legend in the furnace that will explain those flashes.

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Old 10-22-2012, 08:27 PM   #3
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Lennox G26Q3-75-1 Furnace does not fire up


http://hvacpartsshop.net/G26_Series.pdf

when it does not "fire up" what does it do? IOW, sit in front of the furnace and tell us the sequence of events that happen with a call for heat when the unit does not "fire up".

As how said, diagnostic flash codes can give you a clue as to why the furnace does not work.
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Old 10-22-2012, 09:58 PM   #4
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Lennox G26Q3-75-1 Furnace does not fire up


That would be a lock out,turning the power off resets it. Weak flame sense from dirt and rust on the burners and flame sensor would be my guess. When you pull the burners out to clean them look into the heat exchanger for cracks.

If it still has the original blue johnson controls ignition module that's probably one problem.

Last edited by Marty S.; 10-23-2012 at 05:55 PM.
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