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Old 02-23-2010, 08:48 AM   #1
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Tempstar 5000 keep reigniting


I have a Tempstar 5000 high efficiency furnace that is about 15 years old. Recently it started reigniting off & on at the end of each cycle. Usually at about 60 second intervals. This is causing the unit to run longer and I'm afraid it might cause the ignighter to fail.

I researched it down to possibly the flame sensor but I cleaned it with steel wool and nothing changed. Next I replaced the pressure switch but no change. I also cleaned the lower A-frame and change the filters monthly. I only use the cheap see-thru filters to get max airflow.

I wanted to squeeze one more winter out of the unit since our money is tight right now. Can anyone point me in the right direction or possibly offer more suggestions?

Thanks in advance

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