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Old 12-04-2021, 12:07 PM   #1
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Dometic Comfort Control Thermostat

Having a problem with the thermostat in the bedroom that controls 2 zones. One of the zones is turning off on itís own. I can get it to turn on again after flipping the on and off switch a few time but after a short while it turns that selected system off and returns to the grey screen.

While this is a generic system in many RVs, many previous response request the Rig Info. So here it is

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Old 12-04-2021, 05:46 PM   #2
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I would first try the factory-recommended reset procedure. It would help if you can post a pic of your thermostat.
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Old 12-05-2021, 08:50 PM   #3
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Tried the system reset and now only have one zone.

Really looking for anyone that has had this problem before...

It is a generic thermostat that is in most RVs. Can I just replace it? Is there a better thermostat I can replace it with? It is commonly referred to as the 5 button model made by Dometic model is the Comfort control.

When I opened it and looked at the circuit board, I noticed on red indicator on a row of white... anyone familiar with this?
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Old 12-05-2021, 09:37 PM   #4
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Most all "loss of zone" issues are caused by corrosion on the communication cable end connectors. This is the small plastic "phone" connecters on the end of the communication cables. Most of the time, it is the end located at the air-conditioner. The cables sit just in front of the inside coil (Evaporator). You can buy the crimping tool and some new ends at the big box stores. It is VERY important that you place the new end on the exact same way as the old end.
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Old 12-06-2021, 01:59 PM   #5
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So I will check out the cable end at the AC Coil... Curious, where is the other end of the cable... Since there are two units operating off this one thermostat, there has to be a box they connect to to "mix the signal to the one thermostat? Any idea where it is? Is this the same as a telephone cable which I have a few long extensions left from the bygone era of land lines to use to possibly replace it?
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Old 12-06-2021, 02:11 PM   #6
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Quote:
Originally Posted by seand1109 View Post
So I will check out the cable end at the AC Coil... Curious, where is the other end of the cable... Since there are two units operating off this one thermostat, there has to be a box they connect to to "mix the signal to the one thermostat? Any idea where it is? Is this the same as a telephone cable which I have a few long extensions left from the bygone era of land lines to use to possibly replace it?
The cables are not telephone cables. The difference with communication cables is that one end is upside down.

Typical cable routing is that one cable runs from the thermostat to one AC control board. The board has two connection ports for cables. A second cable is run from the first AC to the second AC, daisy chain style.
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