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Old 12-02-2020, 01:12 PM   #1
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Air Conditioner Cuts Out After 2 Minutes

I have a Dometic/Duo Therm air conditioner, model 630035.321. I think it is referred to as a Penguin. The unit starts fine and cools, and using the heat pump heats fine, but only for about 4 minutes. It then shuts down, and just hums. When this happens, I shut the breaker off as it doesn't trip by itself. The same thing happens if I just run the fan on the unit.

I have replace both capacitors, and it has made no difference at all. Everything is clean and all cooling fins are clear as I wash them out twice a year.

While testing the unit, I have observed the motor getting extremely hot. I am guessing over 200 degrees as I can only touch it for a second. The motor spins very freely by hand, and makes no noise at all when it spins. I think all the bearings are fine, but I believe it is getting way too hot and there may be some type of thermal protection that shuts it off when it gets too hot.

Any thoughts on where to check next, or just try a new motor?
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Old 12-05-2020, 11:05 PM   #2
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Fan Motor 'thermal cutout' is shutting it down
Fan air wheel turns freely....motor starts ok then overheats

Bad Motor...
*check AC Voltage
Low AC Voltage can also cause motor high temps
Lower Voltage/higher amps==HEAT

*Check Fan Motor Continuity
The motor leads are white (common), black (high speed), red (low speed) and yellow (medium speed). Some units are 2-speed.
If you are checking a 2-speed system, disregard the yellow wire.

To check the motor, turn the unit circuit breaker to OFF.
With an AC volt meter, verify that the circuit has no AC volts.

Set your VOM to the ohms scale. You will perform a continuity test. *Check for continuity between the white wire and each of the other wires.
Lack of continuity between the white wire and any of the
other wires indicates an open circuit and requires that the
motor be changed.

*Next, check for continuity between each wire and the green/yellow wire. (Casing Ground Wire)
If you get continuity, you have a grounded motor and it must be replaced.
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Old 12-06-2020, 06:01 AM   #3
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Nice rundown. That should sort it out.
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Old 12-06-2020, 07:33 PM   #4
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Quote:
Originally Posted by Old-Biscuit View Post

Set your VOM to the ohms scale. You will perform a continuity test. *Check for continuity between the white wire and each of the other wires.
Lack of continuity between the white wire and any of the
other wires indicates an open circuit and requires that the
motor be changed.
Even if you have continuity between all the wire you still could have a shorted winding. Shorted meaning a short between the run and start winding or short in either winding in it's self. Both conditions will cause the motor to overheat and shut down. I would guess that what you have. Usually if you have a open winding (no continuity) the motor will not start but hum.
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Old 12-07-2020, 02:28 AM   #5
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Thanks for the replies. My meter leads broke, so I am off to buy another one today.

One additional clue. My unit has two fan speeds. I have never tried to run it on anything but AUTO that I can remember. Just for a test, I switched the fan to LOW and it immediately tripped the breaker. I did this several times and the breaker always tripped. On HI it runs for about two minutes and then stops without tripping the breaker. (I always shut the breaker off myself).

Does that add any clues as to the problem?
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