Question about Intertherm P3RA-048K Air Conditioner

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Furnace won't stay on

My intertherm furnace has been working very well until just lately. I woke up one morning and the it was 61 degrees in my home but my thermestate was set for 68 degrees. I noticed that my furnace would still blow out warm air but only for 20 to 30 seconds before stopping and then starting again. The furnace would run again and then the fan would run again for the same amount of time...and so on.. Basicly it wouldnt stay blowing long enough to raise the tempature.....

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  • 306 Answers

Flame sensor could be dirty. It is located right beside the last burner looks like a thick piece of wire. Take steel wool and gently clean the probe 4 or 5 strokes is all it will take to take off the carbon build up off. Lets eliminate this item and see if it clears up okay. ken

Posted on Dec 21, 2008

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