Question about Intertherm P3RA-048K Air Conditioner

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Short Cycle I have an Intertherm Model 497580 in a manufactured home. It continually short cycles. The blower will cut on and cut off about every 2 mins. I have had two different "professional" HVAC people come out and it still does the same thing. One replaced what I think was a relay. Small round black disk with two wired. That was $138.00. The other came (twice) and check Tstat adjusted something on it. That was $50.00. It does seem to run longer if the grate and filters are off and it is completely open on the front. Yes it does have brand new clean filters in place. Any suggestions, I can pass on the the repairman. It's getting pretty cold here in Montana!! If not for my pellet stove, it would be too cold. Oh Yeah there is no vent under the Tstat or close enough to blow on it either. It is located on and interior wall and no drafts nearby. ANY Help or suggestion will be greatly appreciated!! Ron Boswell East Helena, Mt. I know listed below is not the correct model etc. but I could not send this without something in there.

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  • sctrooper77 Dec 10, 2008

    I'll pass that onto the repair man I used last. Thanks for responding to my question.

  • dulaney777 Dec 11, 2008

    I also have the same problem. The unit will turn on and off before it reaches the correct temp. I don't have any problem with it heating, just staying on without cutting on and off. I have the InterTherm Model M1GC056ABW. I have also had a repair man look at my unit several times, and also changed out what I believe was some type of relay switch at a cost of $130.00, although the problem was not corrected, it did make the unit run longer than before. Now the unit has begun to cut on and off more frequently than before. Any help would be greatly appreciated.


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It sounds to me like the motor itself is going off on its overload protection. taking the panels off may be allowing it to stay cool a little longer. also it sounds like the first guy replaced some type of temp. sensor.

Posted on Dec 10, 2008

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