Model 7333A881 (1995) - fan stops after 7 or 8 minutes. Compressor continues to run. Motor spins freely by hand. I replaced the fan capacitor. I checked the power coming from the control board to the high fan wire. It is always a steady 120 Volts even when of for over 20 minutes. Could this be a problem with the thermostat, a relay tripping after 7 minutes or something else?
Remove green (fan run) wire from thermostat, and connect to red wire (power) and see if fan runs, and if it will stay running. That will by-pass thermostat to see if it is problem. If it continues to run, thermostat is problem. If that doesn't cure it, I'd remove cover up top and with power off at circuit breaker, blow compressed air in to motor air holes to make sure it's getting proper air for cooling, as well look for small plastic plug on housing where oil can be added ( few drops) to lubricate motor. Leave cover off and try fan to see if that may help. If at all possible, a clamp on amp meter will confirm if motor or relay is at fault if none of these suggestions help. If amp draw at motor too much, motor may be seizing when warmed up from running. test draw when first started and after running for amount of time that it usually quits, and if noticeable difference, motor is seizing and needs replace. You can also test amp draw at main 120v feed wiring with unit just in fan mode.
Testimonial: "Thank you very much Mike for the answer. It WAS the thermostat. I completely ruled it out since it was just replaced 2 months ago. Thanks again."
SOURCE: Compressor fan spins at low speed
The contactor is a power passing device.Even though it is closing, it is possible its not passing the required voltage to operate other power consuming components such as the compressor and fan.Being exposed to the elements it's common for the contactor to go bad.They are fairly inexpensive and I would start by replacing it first before accusing any other component.
SOURCE: We have a Coleman 7300 rooftop ac unit. When the
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.
SOURCE: RV air conditioner. Compressor running, fan stops before cool
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.
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