Question about Intertherm P3RA-048K Air Conditioner

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I have a intertherm furnace that won't kick out just keeps going

Furnace that won't kick out of cycle just keeps running

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Hello , I think I can help , with the power off to the unit disconnect the wiring on the thermostat and remove it make sure the wires are not touching, turn power back on and see if the unit still runs , if not thats the problem pickup a new tstat , if it still runs then you have a sticking contactor in the control panel of the unit , all of the componets in the unit feed off the contactor and its easy to find its about two inches by 3 inches. There are a set of contacts in it that will be blackend or burnt , remove, label all wires where they were going and pickup a new one at any Hvac, A/C warehouse.
Hope that helps , let me know how it turned out.

Posted on Dec 30, 2008

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It most likely mean that the condenser needs to be cleaned up.
At hardware stores and A/C shops, they sell a cleaner for it, get the ECO frienly version. Instruccions are in the bottle.

If condenser looks clean, (that you can see thru it), then check fan motor, it could be going bad not giving the right RPMs. When this happens, it overheats.

If the condenser can't get rid of the heat the evaporator picks up, the compressor overheats and the thermal proteccion device kicks in to protect it from getting damaged..

Don't forget to rate this post!! Good Luck!!

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Need more info. Are you saying that when tstat calls for heat then it short cycles. But if you turn it off then back on it runs ok?

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