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Old 07-29-2016, 03:06 PM   #1
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Ac help

My rear Ac compressor cycling. The fan remains on but the compressor will run for a few minutes then turn off. Then back on after a bit ect ect. I am plugged into 50amp. Any advice or do I need a technician or replacement? Any help is appreciated. Ken.


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Old 07-29-2016, 03:41 PM   #2
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1. Is this behavior new? i.e., it's different from previous operation

2. Is the "FAN" switch on the thermostat set to "FAN" or "AUTO"?

3. What temperature is the thermostat set to and what is the inside temperature?
What I am asking is are the two temperatures within a few degrees of each other, or is there a big difference?
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Old 07-29-2016, 03:43 PM   #3
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Make sure your thermostat is set for AUTO not fan.


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Old 07-29-2016, 03:44 PM   #4
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Normal operation, the fan should turn on then after 30seconds or so the compressor kicks on to cool. After desired temp is reached the unit turns off. My rear unit the fan turns on. The compressor turns on then after a few minutes turns off, the fan remains on and a few minutes later the compressor back on ect ect. Never reaching the temp setting on t stat.


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Old 07-29-2016, 03:51 PM   #5
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Quote:
Originally Posted by Billr View Post
Make sure your thermostat is set for AUTO not fan.


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Yes it is in auto.


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Old 07-29-2016, 03:53 PM   #6
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Inside is set to 77. Actual temp is 86 in rear.


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Old 07-29-2016, 07:29 PM   #7
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Just for testing purposes, set the thermostat to 68 degrees. See if that changes the compressor cycling problem. Could be a thermostat problem if the compressor keeps running at the lower set-point.
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Old 07-29-2016, 07:43 PM   #8
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Reset the thermostat! Turn off the units on the thermostat. Wait 10 seconds or so, then press the zone and mode button simultaneously until the available zones show on the screen. Turn the zones to your desired temps. If your fan is not on auto doesn't mean anything more than the fan won't turn off.
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Old 07-29-2016, 08:40 PM   #9
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I did the reset a few times. The compressor doesn't even run enough to get condensation from the drain line. My front one is draining like normal. The back one doesn't. The compressor is not running long enough to cool or to even produce condensation.


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Old 07-29-2016, 08:42 PM   #10
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Do you have a way to test the air temperature coming out of the AC ducts when the compressor is running? If you do the air temp coming out should be 15 to 22 degrees cooler than the room air. If not you have an issue.

Second question do you notice an oily substance on or near any of the AC vents? Just a guess, but if you do then you probably have a blown compressor that is overheating and shutting down.
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