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Question About Lennox International Inc. Furnace G40UH(X)
Troubleshooting - alternating fast flash of green and red lights...

According to the manual, there's not enough voltage coming to the furnace. I turned the power off and on and after working for a couple of minutes, the furnace shuts down. I've never had this problem before. Could it be a loose wire? What can I do to troubleshoot/fix this?

Asked by Kris on 12/04/2009 1  Answer

ManualsOnline posted an answer 14 years, 11 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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