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Old 08-21-2016, 10:54 PM   #1
Join Date: Aug 2012
Posts: 43
Dometic ac issue

My a/c unit in my 2015 freedom express 236bhs cools tt very good.the problem is that when it satisfies the thermostat,i.e. 72 degrees,it will not come back on when the temp goes up.I can turn it off at thermostat,then back on, then it will resume cooling.I did this twice the other night,then later on it would cycle as it should.The unit has a single zone digital thermostat which I replaced.Unit still does same.The outside temp and humidity have been very high. My dealer service manager said to move the sensor wire inside unit,however,I can find no sensor wire other than the freeze sensor wire on the evaporator core which seems to be in the proper location. I have researched all over the forums and Internet figuring that this has been addressed before,but have found nothing.I have called Dometic service but have only been told to take it to dealer.Dealer says they can take tt in sept and it will take at least several weeks to get warranty auth from Dometic. I am not impressed with this choice since they probably will not try hard to duplicate symptom.

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Old 08-22-2016, 08:35 AM   #2
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Join Date: May 2015
Posts: 485
Appears similar to my problem. I replaced the thermostat and no joy. RV tech determined the board in the AC unit itself was bad.

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Old 08-22-2016, 08:47 AM   #3
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Join Date: Mar 2008
Location: Southwest Alabama
Posts: 4,513
As phillyg said, it's most likely the control board in the A/C. You can try initializing the thermostat and see if that solves the problem.

Here's the procedure.
System Initialization
A system initialization will need to be performed by the installer after the system is installed.
• Make sure the Single Zone LCD thermostat is in the Off condition. See page 4, “Quick Reference To Control Buttons”.
• Press the “+” button and, while holding it, also press and hold the On/Off Mode button for three seconds. LCD will show ― ― . Press the On/Off Mode button again to turn system off.
This completes the initialization.
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Old 08-22-2016, 10:17 AM   #4
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Join Date: Sep 2015
Location: Penfield
Posts: 178
I have the opposite problem with ours. When the A/C reaches the programmed set point (74 deg) it just keeps going until we notice that it's really cold in the camper. I'll try doing the reset.

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Old 08-22-2016, 02:37 PM   #5
Join Date: Aug 2012
Posts: 43
Angry Dometic ac issue

THanks for the replies.I talked with ac specialist at forest river this morning.He said that it is probably the control board since I have already replaced the thermostat.I will probably replace the control board at my own expense since it is so frustrating dealing with my dealer. Warranty claims are aggravating to say the least.

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