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Question About Lennox International Inc. Furnace (1991) G1403-40-20
popping or backfireing...

My neighbor has replaced a airfilter and a sparkplug but is having a problem. He does not have a computer and asked for my help. He is looking for service manuals for this unit. He is also wondering what the sparkplug gap is.

Asked by Paul on 10/17/2011 0  Answer

ManualsOnline posted an answer 13 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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