Lennox G40UH(X) Induction fan - no operation


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Old 02-16-15, 06:43 PM
J
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Lennox G40UH(X) Induction fan - no operation

It's -10 degrees and my furnace died. It's a Lennox model: G40UH(X). When I turn it on I can hear several relays click, then a steady hum, the diagnostic LEDs indicate "power on - Normal operation" (both LEDs - slow flash). But, nothing happens. According to the manual the induction air inducer is supposed to kick on. I jumpered 120V to the induction air inducer motor to ensure it operates and it started right up. Any ideas why it's not receiving power?
 
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Old 02-20-15, 11:08 PM
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Just a wild guess, but maybe the thermostat isn't sending the signal to start up your furnace?
 
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Old 02-20-15, 11:16 PM
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Welcome to the forums.

More than likely the relay on the control board either has a solder problem or the contacts are dirty. When the unit calls for heat.... tap gently on the control board with the handle of a screwdriver.
 
 

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