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Old 05-07-2012, 09:38 PM   #1
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A/C compressor is running continuosly

A/C compressor (I think that is what it is)
is running when the fan shuts off Just started last evening. I tripped the circuit breaker to stop it. You can turn the unit on and off with the thermostat
and and it seems to cool fine. The problem comes when it shuts off.
Something keeps running up in the roof mounted unit. Any suggestions?
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Old 05-07-2012, 09:55 PM   #2
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Bad thermostat?
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Old 05-07-2012, 10:36 PM   #3
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Fan could be in ON position instead of Auto?
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Old 05-07-2012, 11:13 PM   #4
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There are very few that act like your house AC unit, in other words everything shuts down. On most, the fan runs continuously, and the compressor cycles, but the fan is always running. You didn't mention brand, model number of the AC, or the thermostat.
A little more info would help, as not all RV's are created equal.
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Old 05-08-2012, 12:00 PM   #5
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Quote:
Originally Posted by windrider
There are very few that act like your house AC unit, in other words everything shuts down. On most, the fan runs continuously, and the compressor cycles, but the fan is always running. You didn't mention brand, model number of the AC, or the thermostat.
A little more info would help, as not all RV's are created equal.
I do not know what kind of A/C unit. Can not tell by looking at it from inside (no labels). The thermostat is a Duo Therm by Dometic. I appreciate your help Sorry I can't give you more info
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Old 05-08-2012, 04:00 PM   #6
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I do not know what make the A/C. I cannot find any labels that tell by just taking the filter out and looking. I imagine it is the OE (2004 Georgetown 359 TS). The thermostat is a Duo Therm by Dometic. Sorry I can't give you more info. We are in the mountains of Eastern PA and it is cold, foggy, and rainy. Don't think we will need it tonight. Thanks for your help. It is much appreciated.
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Old 06-09-2012, 07:08 PM   #7
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We have replaced the thermostat. The fan is in auto and it cycles ok. The ac compressor keeps running regardless of thermostat setting. The only way to shut the compressor off is by throwing the circuit breaker. Any ideas?
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Old 06-09-2012, 08:16 PM   #8
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Is this a new unit? Without actually seeing the installation, it looks like the wiring for the compressor and evaporator/condenser fan is reversed. As Windrider already pointed out, on most of our units the fan runs continuously and the thermostat cycles the compressor. The compressor should NOT run without the evap/condenser fan.
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Old 06-09-2012, 08:24 PM   #9
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No, it is not a new unit. I imagine it is the original (2004 year). We have had it for two years with no prblems. This just started one night recently. I replaced the thermostat and wired it just like the original
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Old 06-09-2012, 08:37 PM   #10
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OK, I'm guessing that the compressor relay (normally open) has failed in the closed or powered position, but it's hard to know without actually seeing the unit. I'm afraid that you need to have it looked at by an AC person. Good luck!
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