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Old 06-15-2010, 08:50 AM   #1
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Trane XL1200 trouble


My Trane XL1200 stopped working. The thermostat is set properly for cooling but the unit does not turn on. So I went outside and found the outside unit just buzzing/humming. I got my electrical test meter, there is 220 volts coming into the unit. When I pull the quick disconnect the humming stops. When I reconnect the disconnect the unit clicks like it is trying to start. Then in a few seconds it clicks and the buzz becomes much softer like a safety switch is keeping the unit from harming itself. The buzz is inside the unit, maybe coming from the compressor. I also tried to turn the fan blades on top and they do not turn freely. The buzz is not from the fan motor.

As you can tell I don't have any knowledge about ac heat pumps but I am willing to try and learn.

Help me if you can.

Victorhobby

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Old 06-15-2010, 11:30 AM   #2
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Trane XL1200 trouble


could be the run capacitor. if the fan doesn't spin freely that's a problem. the fan should spin freely, so maybe the motor is seized up. a quick easy thing to try with the fan is flip it over and squirt some oil down in the drive shaft area and see if the frees it up a bit to get it going.

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Old 06-15-2010, 05:00 PM   #3
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Trane XL1200 trouble


NitroNate, I will try putting oil on the bushing or bearing of the fan motor good idea, How do I check the run capacitor??
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Old 06-15-2010, 05:29 PM   #4
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Trane XL1200 trouble


If its a sealed bearing motor. Oiling it can do more harm then good, to your system.
The fan may start to spin. But can be spinning slower then it should. And cause your compressor to over heat internally. And burn it out.

Which cost more to replace then a seized fan motor.
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Old 06-15-2010, 05:46 PM   #5
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Trane XL1200 trouble


Thanks, the fan motor did not turn freely, I added oil and now it turns freely. Unnoticed to me was the fan was not running before and it is now when the thermostat is on for ac. Taking the outside unit apart to get to the fan revieled the buzzing sound is a relay run by the thermostat to turn on the 220v. But alas the compressor does not come on. How do I check the capacitor for the compressor???
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Old 06-15-2010, 05:47 PM   #6
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Trane XL1200 trouble


take the access panel off the outside unit, should be round or oval shaped. if it's bulging on the top or bottom it's most likely bad. to test it, you need a digital multimeter that tests for capacitance.

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