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Old 07-20-2019, 10:32 AM   #1
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Air conditioner stops during the night

Air conditioner works well during the day but at night it stops (while I知 sleeping) and I need to turn it off for about 15 seconds. Upon turning it back on it runs fine. Any ideas?
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Old 07-20-2019, 10:57 AM   #2
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Ghost's?
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Old 07-20-2019, 04:41 PM   #3
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Icing?
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Old 07-20-2019, 05:42 PM   #4
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Maybe. Night temps get cooler so ice doesn’t melt as fast?
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Old 07-21-2019, 12:32 PM   #5
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Quote:
Originally Posted by rogerkathy View Post
Air conditioner works well during the day but at night it stops (while I知 sleeping) and I need to turn it off for about 15 seconds. Upon turning it back on it runs fine. Any ideas?

If the outside temps become too low the AC is likely shutting itself down to protect it. On the other hand, if the outside temps are 60 or above you may need a tech to review it.
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Old 07-21-2019, 12:36 PM   #6
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Could it be reaching the temp you have it set @ ???
Do you relay want it running 24/7 ???
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Old 07-21-2019, 12:36 PM   #7
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See Post #5 here:

AC quit working

You may have an ice sensor. May be your issue.
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Old 07-21-2019, 12:47 PM   #8
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Good info. I知 guessing the ice sensor is shutting down the conditioner because of the high humidity we have had and the lowering of temps. Only real issue I致e had is getting up during the night to turn it off for about 15 seconds the back on. Seems to fix it.
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Old 07-22-2019, 12:46 AM   #9
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I seldom use my AC, but I read somewhere that once an AC unit is turned off it needs a few minutes to equalize internal pressures before it should be started again or you're putting unnecessary strain upon the compressor. That makes sense to me, but it could be an old husband's tale too. Worth checking out.
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Old 07-22-2019, 08:32 AM   #10
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Could be icing or a sensor but 15 seconds is not enough time for a unit with ice to thaw.
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Old 07-22-2019, 08:40 AM   #11
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What he said........^^^^


But.....mine turns off at night, too. Good thing, or I'd freeze!

Sounds like it may be doing what it's supposed to. BUT.....is it turning off while it's still obviously hot in the trailer???? Is fan set to AUTO?


What kind of trailer? What kind of A/C unit?
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Old 07-22-2019, 09:06 AM   #12
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Quote:
Originally Posted by metalsideup View Post
I seldom use my AC, but I read somewhere that once an AC unit is turned off it needs a few minutes to equalize internal pressures before it should be started again or you're putting unnecessary strain upon the compressor. That makes sense to me, but it could be an old husband's tale too. Worth checking out.
True. Called Short Cycling. From a Coleman-Mach O&M manual:
III. Short Cycling
When an air conditioner is in operation, its compressor
circulates refrigerant under high pressure. Once off, it will
take two to three minutes for this high pressure to equalize.
The air conditioning compressor is unable to start against high
pressure. Therefore, once the air conditioner is turned off, it is
important to leave it off for two to three minutes before
restarting.

Short cycling the compressor (or starting it before pressures
have equalized), will in some instances, kick the circuit
breaker or overload.
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Old 07-22-2019, 09:26 AM   #13
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However, if the AC is already off and not functioning at the moment, turning the thermostat off and back on has no ill affect on the AC unit. Aside from that, Dometics have a built in delay.
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Old 07-22-2019, 11:42 AM   #14
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Old 07-22-2019, 06:32 PM   #15
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The issue is air conditioner turns off at night when it is still warm inside the trailer. I wake up to no air conditioning and warmer temps in the trailer. Air conditioner is NOT running, is set at 73 on AUTO. Normally it comes on around 75-76 degrees but I awake to find it is about 78-80 and has not come on. I shut off the air conditioner for about 15 secs (remember, it is NOT running), turn it back on and it runs fine. Outside temps have been around 80 at night, 90-100 during the day. It is a Dometic and I have a 323 MK Wildcat 5th wheel.
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Old 07-22-2019, 07:30 PM   #16
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Originally Posted by rogerkathy View Post
The issue is air conditioner turns off at night when it is still warm inside the trailer. I wake up to no air conditioning and warmer temps in the trailer. Air conditioner is NOT running, is set at 73 on AUTO. Normally it comes on around 75-76 degrees but I awake to find it is about 78-80 and has not come on. I shut off the air conditioner for about 15 secs (remember, it is NOT running), turn it back on and it runs fine. Outside temps have been around 80 at night, 90-100 during the day. It is a Dometic and I have a 323 MK Wildcat 5th wheel.
Try taking the fan out of AUTO and put it on Low or High, your choice. Keeps the air moving and evens out the temperature in the rig. Also, if it's an analog thermostat, that's probably your real problem. Dump it for a digital one. Keeps the set temperature much better.
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Old 07-23-2019, 02:47 PM   #17
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It is a digital thermostat. Good idea to try leaving fan on high instead of auto. I知 done for about 2 months but will keep this idea in mind.
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