AC shutting off

cheftjpeck · 03-21-2019, 03:10 AM

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

cavie · 03-21-2019, 04:02 AM

Quote:

Originally Posted by cheftjpeck

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.

bubbles · 03-21-2019, 05:48 AM

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.

Witch Doctor · 03-21-2019, 06:05 AM

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.

Witch Doctor · 03-21-2019, 06:07 AM

Should read without a amp probe to read your motor amps.

**Bama Rambler** · 03-21-2019, 09:35 AM

Quote:

Originally Posted by cheftjpeck

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.

Scrapper · 03-21-2019, 11:04 AM

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.

cheftjpeck · 03-21-2019, 01:15 PM

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 ?

**Bama Rambler** · 03-21-2019, 01:24 PM

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.

Witch Doctor · 03-21-2019, 01:26 PM

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.

Iwannacamp · 03-21-2019, 01:31 PM

Gotta love electronics... The unit isn't really old enough to have a "worn out" motor. My suspicion is a quirky thermostat. Warranty? if not check the model and buy as you will.

cheftjpeck · 03-21-2019, 01:51 PM

Quote:

Originally Posted by Iwannacamp

Gotta love electronics... The unit isn't really old enough to have a "worn out" motor. My suspicion is a quirky thermostat. Warranty? if not check the model and buy as you will.

Yeah it actually did this a few times since we first got it but of course camping world couldn’t duplicate it ..
Where is best place to get thermosyat? How can I tell which one to get ? I’m sorry if I’m asking too many questions

Witch Doctor · 03-21-2019, 02:13 PM

Quote:

Originally Posted by cheftjpeck

Yeah it actually did this a few times since we first got it but of course camping world couldn’t duplicate it ..
Where is best place to get thermosyat? How can I tell which one to get ? I’m sorry if I’m asking too many questions

Call dometic, or you could probably fine one on eBay, they normally have pictures. Dometic are different you can't just buy another stat, instead of positive 12 volt they use a negative ground. They are the only people who do that.

cheftjpeck · 03-21-2019, 03:32 PM

Thank you .. I will replace thermostat and go from there

Iwannacamp · 03-21-2019, 08:39 PM

Quote:

Originally Posted by cheftjpeck

Yeah it actually did this a few times since we first got it but of course camping world couldn’t duplicate it ..
Where is best place to get thermosyat? How can I tell which one to get ? I’m sorry if I’m asking too many questions

If you aren't in a hurry...eBay can be a good source. Once you figure out which one it is.... You can Google the model/style and see your best source. It wouldn't surprise me if it were Coleman...unless you already stated that I didn't see.

If you need help post a pic and we can try

Iwannacamp · 03-21-2019, 08:42 PM

Ps: if it is Coleman and it's analog I think they make a digital replacement for 30-40% more.

cavie · 03-21-2019, 08:51 PM

Quote:

Originally Posted by cheftjpeck

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 ?

Do you have central air at home or a window unit? RV air works more like a central unit than a window job. Be sure you understand the operation before you go changing the T-stat.

cheftjpeck · 03-21-2019, 10:04 PM

Quote:

Originally Posted by cavie

Do you have central air at home or a window unit? RV air works more like a central unit than a window job. Be sure you understand the operation before you go changing the T-stat.

I have central air and understand how a central air works. I have had it on high fan all day today and it hasn’t gone off .
I know when the rv ac is on auto it starts out in high mode then kicks to low fan mode when temps are closer then off when temp is achieved. Currently the unit will work perfectly then it will stop .. and no matter how low I drop temp It won’t come on ..I have to shut it off and turn back on /. Then even earlier i had it low fan mode then it went off after a while .. I had to turn it on fan mode and so far it had stayed running .. it will turn in ac itself if it gets warmer than set temp .. it’s only a year old ... very frustrating ...

cheftjpeck · 03-21-2019, 10:24 PM

Quote:

Originally Posted by Iwannacamp

If you aren't in a hurry...eBay can be a good source. Once you figure out which one it is.... You can Google the model/style and see your best source. It wouldn't surprise me if it were Coleman...unless you already stated that I didn't see.

If you need help post a pic and we can try

It’s a dometic .. been trying to post a pic without much luck .. single unit .. controls ac and heat .. non programmable .. pretty basic lcd with blue lighting background

Witch Doctor · 03-22-2019, 07:12 AM

Is this your stat?

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