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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 12 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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