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Old 09-07-2008, 08:57 PM   #1
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1994 34' Excella
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AC not working

I have the original Dometic Doutherm AC in my 94' AS. Today I noticed an issue. When I turn it on, it runs for 2 minutes(normal) and then the compressor kicks on (normal). However after running for 30 seconds to 2 minutes the compressor will kick off and not come back on. I shut it off and repeated several times with the same results. This unit has the auto feature on the thermosat along with the high, med, low mode. No combination of speed settings or t-stat settings seems to make any difference. Any thoughts/ advice? Thanks in advance.
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Old 09-07-2008, 09:24 PM   #2
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air conditioner

The thermostat may need to be replaced.

You maybe running the unit on too low voltage. The voltage should not be lower than 118 volts.

The coils could be so dirty that you do not have enough air flow.

You could have a bad compressor.
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Old 09-07-2008, 09:56 PM   #3
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To shut down that soon I would look at the voltage. I think the unit is kicking out on thermal overload which low voltage can be one of the causes.

As soon as the compressor comes on take a voltage reading at any of the 110 receptacles. Anything below 110 will cause extra heat in the compressor and may trip the overload switch.
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Old 09-07-2008, 09:59 PM   #4
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Voltage is good. I have a dedicated 30 amp circuit to plug my camper into. Went outside to try again one more time. Air temp is now 70 degrees versus 85 from earlier today. It kicked on and ran for at least 5 minutes. I came back in the house but left it running with t-stat set at 65 degrees. Somewhat puzzled. I am going to pull the shroud off and check the coils after work tomorrow.

I will double check voltage with meter just to make double sure. Power is coming directly from my home's breaker box.
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Old 09-08-2008, 06:31 AM   #5
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silver 67, how did you come up with that voltage of 118? In the CG that my A/S is in now, the voltage is seldom above 116. Drops to 109 to 111 when the fan is on high and comp is on. Does trip the breaker once in a while, but can go for days when it does not.
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Old 09-08-2008, 08:12 AM   #6
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Yes you may have a 30 amp circuit for your trailer but when trouble shooting a problem you should eliminate the potentials that would most likely cause the conditions you are facing. Can you say that circuit is good or are you just assuming it is good.

You did not mention if the fan was running at normal speed. No fan would run the head pressure up and if equipped with a high pressure switch would cause a shut down.

If the electric checks out OK and you do remove the cover I would wire the compressor directly and if possible have a clip on amp meter reading the amperage as the compressor runs. If the compressor will run and remain on while hard wired get back to us.
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Old 09-08-2008, 08:19 PM   #7
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I assume the circuit is good as it is less than a year old and runs my rear unit (doutherm 13,500) just fine. I will double check voltage as soon as I get batteries for my meter. The fan speed is same as usual. Tried it again this evening. It (compressor) engaged for approximately 2 minutes and kicked off. Never would kick back on. I will try your other tests ASAP. Thanks a bunch.
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