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The furnace was sputtering upon startup and eventually would ignite and run properley. The furnace company removed the air flapper valve, replaced the new flapper material, and the furnace worked IOK for a while then started sputtering and startup again! I decided to check it myself and found...

I have a Lennox Pulse furnace model G14Q3-60. The manual indicates there is a specified distance (clearance) between the tow plates of the Air Flapper Valve, but I cannot find that specification anywhere. Any help would be appreciated, thanks.

Thanks for the info, but I checked the outlet and it seems to be totally clear. I think I am dealing with a faulty glue joint, as everything else seems to be ok.

My Lennox high efficiency gas furnace model G14Q3-60-C6 has been working great for 18 years. Yesterday I noticed condensation on the outside top surface of the "Flue" Attenuator, (exhaust muffler?) The condensation seems to be dripping from the PVC exhaust pipe joint where it connects to the...