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Old 07-17-2018, 05:05 AM   #1
drharrold
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A/C not cycling

Having a strange A/C issue on my 2017 2890RL. The A/C is on and running and the trailer gets to the set temp. The unit will shut off. Then when it warms back up, it doesn't cycle on. If I turn it off and back on, it starts right up. My EMS shows good voltage. (117 to 120).

Could it be the thermostat or its it the unit itself?

Thanks for the help.
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Old 07-17-2018, 05:16 AM   #2
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More info on the unit and t'stat would be helpful. Make and model if you have it.
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Old 07-17-2018, 05:56 AM   #3
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Best guess is the thermostat. As far as I know, powering down the thermostat is only going to affect the thermostat, not the A/C unit itself.
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Old 07-17-2018, 05:56 AM   #4
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I don't have the exact model info. It is a domestic A/C unit and thermostat. Picture of the thermostat is attached. Click image for larger version

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Old 07-17-2018, 06:34 AM   #5
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Quote:
Originally Posted by drharrold View Post
I don't have the exact model info. It is a domestic A/C unit and thermostat. Picture of the thermostat is attached. Attachment 17517

When you turn the tstat on, what is the first readout say? AU, HI, LO?


My understanding is that it has to say AU if you want it to cycle. Check that first?
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Old 07-17-2018, 06:55 AM   #6
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A/C not cycling

In AUTO mode, everything turns on/off based on set temp

In HI or LO the fan runs all the time and the compressor cycles based on set temp.

If you cycle to ďOFFĒ then back to cool, there is an issue. Either the thermostat or the control board is probably failing, without testing I canít say.
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Old 07-21-2018, 05:46 AM   #7
drharrold
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Thanks for the replies so far. I appreciate it.

I've done a little more playing, so if it helps, please let me know.

When I set the fan to low, it started and runs. Then I turn it to A/C and or started and the trailer cools down.

When it gets cool, the fan and the A/C shuts off. To get it to restart, I have to set it to fan and wait for the fan to start, then I can set it to A/C. If I don't wait for the fan to start, the A/C won't restart.

Does this point to one or the other?

Dave
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Old 07-21-2018, 05:51 AM   #8
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Yes it does. Iím leaning towards a bad thermostat.
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Old 07-21-2018, 06:05 AM   #9
drharrold
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Thank You!

Do you know a good place to order a new thermostat from? I haven't had much luck searching on Google.
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Old 07-21-2018, 06:10 AM   #10
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Try Dometic website. They should have a search for authorized dealers function. Amazon may have them. Your local RV dealers parts department should stock them.
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Old 07-21-2018, 10:02 AM   #11
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I'd contact Dometic & check with them on warranty on the original.
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