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I had a furnace technician in today and we seem to have solved the problem. After explaining what had been occurring, and all the things that all of you had me try, he was able to jump...

Doh! I did clean the flame sensor, and I did use sand paper (well emory cloth). Live and learn. Ok I'll try again to clean scraping it as you suggest. Will post results

Cold

Oh Felrio had asked for wiring diagrams not sure if any of this will help but here goes:

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2348

Wow I've got everybodys attention now.

Ok so if it is airflow what can I do about it? And why is it happening now? And yes before you ask I changed the filter its brand new.

It has changed...

Thank you both for all your input.

Lab I found the R W and jumped as advised and the therm seems to be working just fine. I also changed the batteries to brand new in therm in case it was a...

Thanks for the input labman, I am watching for a pattern as we speak. Funny thing is the furnace is cooperating a little more now that I'm getting some help such is life.

Now "flat ceramic thing"...

Thanks for getting back to me Felrio. First I tried to follow a post similar to mine answered by Northern Heat and I removed and cleaned the flame sensor. It seemed to work for a while but now is...

Hi, I have the same problem as Senada, Simshak, and JS16. First my info I guess:

Lennox Whisper Heat G20

7yrs old

80% Efficiency

Forced Air furnace

Hi, I have the same problem as Senada, Simshak, and JS16. First my info I guess:

Lennox Whisper Heat G20

7yrs old

80% Efficiency

Forced Air furnace