condenser fan runs when A/C switched off


  #1  
Old 05-31-13, 04:36 PM
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condenser fan runs when A/C switched off

Ok, this has got me stumped. My A/C condenser fan runs when A/C is in off position. But once I turn A/C on the breaker trips. I checked the contacter and it seems to be working, unplugged all the fan motor wires and still does it, but when i unplugged all the compressor wires the fan does work correctly and the breaker does not trip. Is it the Compressor? or am I missing something?
 
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Old 06-02-13, 09:31 AM
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Hard to understand, but sounds like a shorted compressor.
 
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Old 06-02-13, 09:44 AM
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Welcome to the forums.

That must be a single contact contactor ?

Normally when there is no call for AC and the contactor is open.....the fan and compressor no longer get the required 240 VAC. Since the contractor is a single contact model that would mean that half of the supply is being delivered to the equipment even with contactor open. Then since your compressor appears to be shorted....it can return 120V to your fan.

Your fan should have been spinning slowly...... not full speed.

A make and model of your outside unit will probably be needed here.
 
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Old 06-02-13, 12:03 PM
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It sounds like a shorted compressor and a poor or missing ground connection to the unit. This can become a lethal combination.
 
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Old 06-02-13, 03:57 PM
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stop..... call a pro!.........................
 
 

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