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Old 09-14-2013, 04:53 PM   #1
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Condenser fan tripping circuit breaker.

When I turn on the cabin AC the condenser fan does not come on. It keeps tripping the circuit breaker. Everything else is working. It is located under the front end of my HR. The compressor is running, the condenser starts to get hot but the fan will not turn on. I bench tested the fan and it runs like crazy. Any suggestions
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Old 09-14-2013, 08:48 PM   #2
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Is the condenser fan tripping he breaker or is there a problem with the wiring going to the condenser fan motor, you say you bench tested the motor. If you tested the motor with the same capacitor that was running it in the unit and you did not have to spin the blower to get it started then the motor and capacitor are good, I would follow the wires back from the motor and look for either a relay or a switch. If there is not short causing the breaker to trip then it is probably tripping from the compressor drawing high amps after it runs a while without the condenser fan motor
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Old 09-14-2013, 10:12 PM   #3
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What year is your coach? Check for a wire schematic of the control circuit if there is a relay that controls the fan. As already mentioned, if the fan will run without any help, the fan is not the problem. Normally the condenser fan will not trip the breaker, they have internal thermal protection, unless there is a dead short. How long does the AC run before the breaker trips? If it runs for several minutes the breaker is tripping because the compressor discharge pressure is getting to high causing the compressor to draw high amps. Some AC units have a high pressure cutout your's may not.

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Old 09-15-2013, 03:18 PM   #4
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Everything seems to work right away. The compressor is turning, the blower works, the condenser starts to heat up. I did not want to let it run too long without the condenser fan running. The fan is on a circuit breaker that trips immediately and about every 30 sec. Afterwards
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Old 09-16-2013, 12:01 AM   #5
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So the main circuit breaker for the air conditioner is not tripping, just the breaker for the fan? Is the fan breaker one of those round push button breakers or is it an automatic resetting type? Does the condenser fan ever run with it installed? When you bench tested the fan, did it start by it's self without you spinning the fan? Do you have an amprobe or know someone that does. If you have one bench test the fan again and check the running amps of the motor. The running amps should be marked on the motor or a tag on the AC unit.

Chuck
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