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Old 03-21-2019, 03:10 AM   #1
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AC shutting off

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I have a 2018 Forest River Cherokee travel trailer. The ac during auto cool cycle often shuts off. It also cycles between low and high when it is working . I have adjusted temp and it sometimes will come back on but ultimately I would take it out of auto mode and just put fan either low or high to get to work . Well last night even in low fan mode it shut off after a while . I then shut off fan and unit , then turned back on in high fan cool. It works after doing that . What is causing this ? Any help would be greatly appreciated
Thank you
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Old 03-21-2019, 04:02 AM   #2
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Hi
I have a 2018 Forest River Cherokee travel trailer. The ac during auto cool cycle often shuts off. It also cycles between low and high when it is working . I have adjusted temp and it sometimes will come back on but ultimately I would take it out of auto mode and just put fan either low or high to get to work . Well last night even in low fan mode it shut off after a while . I then shut off fan and unit , then turned back on in high fan cool. It works after doing that . What is causing this ? Any help would be greatly appreciated
Thank you
The compressor shuts off after the temp is met. If the fan is in AUTO then the fan will also shut off. When it calls for cool again both will come on. If the fan is set to the ON mode, then the fan will stay on when the compressor shuts off. You can set the fan speed to hi and low in either auto or on.
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Old 03-21-2019, 05:48 AM   #3
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If the fan is set to AUTO the fan speed will automatically revert to low speed when the temperature is within about 2 to 4 degrees of the temperature set on the thermostat. The fan speed automatically switches back to high when greater than about 4 degrees. So, the fan speed cycling is normal operation. As said, if the fan speed is set to something other than AUTO it will not cycle and will not shut down when the temperature on the thermostat is reached.
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Old 03-21-2019, 06:05 AM   #4
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It could be a lot of things, but when you put it in the on position, it should stay on and not shut off even when the compressor cycles. You have said it is also shutting off in that mode, it could be either the motor is going out on motor over load protection. Hard to say , how long does it shut down? The second thing is there is a little sensor in the evaporator coil on the roof, you might have a problem with that. That happens when your coil starts to freeze up. If you don't have a amp probe your not going to be able to tell. I'll bet the sensor is out of placement. Not many motors go bad but it can, once again the motor should not stop in the on position.
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Old 03-21-2019, 06:07 AM   #5
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Should read without a amp probe to read your motor amps.
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Old 03-21-2019, 09:35 AM   #6
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Originally Posted by cheftjpeck View Post
Hi
I have a 2018 Forest River Cherokee travel trailer. The ac during auto cool cycle often shuts off. It also cycles between low and high when it is working . I have adjusted temp and it sometimes will come back on but ultimately I would take it out of auto mode and just put fan either low or high to get to work . Well last night even in low fan mode it shut off after a while . I then shut off fan and unit , then turned back on in high fan cool. It works after doing that . What is causing this ? Any help would be greatly appreciated
Thank you
It kinda sounds like it's working as designed.

You said that "last night even in low fan mode it shut off after a while" did the fan stop or just the compressor? What makes me ask is that you also said that "I then shut off fan and unit" which sounds like the fan was still running.
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Old 03-21-2019, 11:04 AM   #7
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If you have a ceiling vent blowing towards the thermostat it could cause the A/C to shut off before the rest of the rv cools down.
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Old 03-21-2019, 01:15 PM   #8
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Had it in low fan (not auto) and it shut off (fan stopped blowing ) I turned off completely then back on high fan mode .. and it works again for now .
Coils are not frozen over and filter is changed and new ?
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Old 03-21-2019, 01:24 PM   #9
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There have been some reports of similar problems and it turned out to be the control board. You can try to initialize the thermostat and see if that helps. It has in a few cases.
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Old 03-21-2019, 01:26 PM   #10
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Yes my point was that if that sensor is not position correctly your fan will work irradically. I guess it's worth a look. The coil doesn't have to forming ice per say. I doubt it's the stat, that would be easy to find out jumper the stat out and proceed from there. Things to check, stat, blower motor, capacitor,.sensor and ciructt board. I'm not a fan of Dometic, I'll say that right up front.
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