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Old 08-10-2018, 12:00 PM   #11
JRTJH
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stolly,

First you need to understand how the air conditioner works, then make the determination about whether it's normal or if something is wrong.

First, if it is a Dometic/Air Excel/Coleman and you have the thermostat fan switch on High or Low, the fan will run continuously and the compressor will start/stop as cooling is needed. The fan continues to run, providing air circulation at the registers.

If the thermostat is in AUTO, the system responds entirely differently.

When the thermostat set temperature is reached, the compressor will start, followed momentarily by the fan (HI) and the system will operate until the thermostat temperature is within 4F of the set temperature at which time the fan will stop (compressor continues to run) and the fan will switch to LOW speed. Once the temperature is reached, the compressor will stop, fan will continue for about 1 minute, to blow all the cool air out of the ductwork. If, by chance, once the fan switches to LOW, the temperature sensed by the thermostat rises, the fan will stop (compressor continues to run) and switch back to HIGH and continue to run on HIGH until the thermostat again reaches within 4F of the thermostat setting.

It sounds complicated, but you need to pay attention to what "starts and stops" on your A/C before you report that it's not working properly. There is an excellent description in the thermostat manual that describes how it all works.

I'm not suggesting that you're wrong and your system is normal, but rather that you may be facing normal operation without realizing it. From what you've posted, it's difficult to determine the status of your system.
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Old 08-10-2018, 12:35 PM   #12
stolly23
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So all of that I understand. I'm running in auto. The entire unit shuts down for for about 4 or 5 seconds and starts right back up. No where near set temperature as my unit is unable to get anywhere close to where I set it. At night when it does work and reach desired temp, it shutts off and doesn't come back on for half an hour or so.
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Old 08-10-2018, 12:53 PM   #13
JRTJH
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Discuss with your dealer's service writer, see what he/she says....
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Old 08-19-2018, 08:56 AM   #14
tubacjohn
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Return air

Check return air ducting for collapsed ducts.
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Old 08-19-2018, 11:07 AM   #15
ChuckS
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I second checking the return air vents for that AC to see if one is collapsed. You can fix this by working a 1 1/2 inch diameter section of pvc pipe into the duct of collapsed to open it back up. This fixed my bedroom AC cycling issue.
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Old 08-19-2018, 04:24 PM   #16
BadmanRick
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FYI guys. If the temperature is high and the humidity is high and you run the ac on low fan it will short cycle because it is Freezing Up. Run the a/c on fight fan or auto and it should work fine.
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