Question about Intertherm P3RA-036K Air Conditioner

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No heat when I switched thermo to heat,squirrel cage fan comes on but blows only cool air no heat.

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  • Anonymous Mar 31, 2014

    Why is the a/c thermo fan staying on wether the air con is switched on or off the thermo fan stop when engine stops

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  • 124 Answers

Need to know if its a heat pump or electric strip heat. if its a heat pump then compressor and outdoor fan will run on call for heat. being an intertherm and most of them are electric strips, i'll guess. the call for heat sends 24 volts to the heat sequencer. lots of wires connected to what is called a stack switch. wires closest to the mounting plate are 24 volts and when energized they heat up a bimetal disc that clicks on in 90 to 160 second s and energizes the first strip and fan and a few seconds later the 2nd and 3rd strips kick in. for every strip operating you pull about 20 amps. if fan is working then the other parts of the sequencer are failing to close and put power to the strips or the strips themselves are bad. these are very very confusing and tricky to work with. i have to work on them hot to observe where the problem lies. very dangerous as you are going to have to trip a 90 amp breaker if you make a mistake , not to mention the parts are not available except through wholesale only supply house. i feel pretty confident the sequencer is going to be bad and i think its probably best you call a pro to get this one squared away. sometimes when you are tinkering with old sequencers they literally crumble apart in front of you, they can get that brittle. it can be quite an adventure and not for the faint of heart when its hot. good luck.

Posted on Oct 28, 2008

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