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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 15 years, 1 month 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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