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I have an RV with a rooftop AC unit. Often when the AC shuts off the compressor continues to make a fairly loud humming noise and then all of a sudden it will stop with a bang (enough force the RV shakes). Turning the temperature control unit to the off position does not stop the humming. Last evening I had the thermostat set to the off position and about every 20 minutes the humming noise would start and after 10 or 15 minutes stop with a big shudder. It's obvious that something is sticking and not disengaging- but what? I'm a little confused as to why it does it when the AC unit is not even in the on position on the thermostat. Any ideas?
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The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of
tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.
COLEMAN R.V. AIR CONDITIONER SERVICE AND REPAIR QUESTIONS
COLEMAN R.V. PRODUCTS
GO TO rvcomfort.com
Click on RVP (RV PRODUCTS)
Click on type of AC, if you can’t find the information you want there,
then click on contact us on the Green Bar.
You can get Service Support or Email address and Phone numbers.
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