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Old 12-06-2017, 01:29 PM   #1
Jersey Devil
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Dometic Thermostats

In the summer this year we purchased a 2018 3731FL.Nothing but issue after issue with the Dometic thermostats.My opinion they are cheap junk.
I have researched some on this site and have learned that Keystone states they are + or - 5 degrees.Thats surely a tell tale sign they are cheap and how they can stay on the market scamming the consumer is a disgrace.
Not only are they + or - 5 degrees they only work when they feel like it and come on out of no where.
It was 50 degrees out one evening and the wife came home and said something is running in the RV.
Went outside and the bedroom AC was running.We weren’t in it for almost a month so out of nowhere it decided to fire up by itself.
So going in to dealer in a few weeks and will see if they can replace these for real thermostats.
Does anyone know of a reliable thermostat company that will work with the Dometic AC units?
Sure hope this is no indication of the reliability of the Dometic AC units.
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Old 12-06-2017, 04:21 PM   #2
WeBeFulltime
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Although both of ours are off about 2 degrees they are working flawlessly on A/C, Furnace, and Heat Pump.
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Old 12-06-2017, 04:50 PM   #3
AZ Traveler
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My Dometics are off by 4-5 degrees but work well once we figured out where to set them.
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Old 12-06-2017, 04:58 PM   #4
WaltBennett
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Haven't had that issue with the AC - the furnace is what swings way too much, but I don't think that's the thermostat.
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Old 12-06-2017, 05:56 PM   #5
Jersey Devil
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Besides being off 4..5 degrees heat or ac turning on the thermostat is a hit and miss.It sometimes takes 15..20 minutes playing with it because it shuts itself on and off as it pleases.Very frustrating.
Also I was told I have heat pump feature with units but says nothing on thermostat?
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Old 12-06-2017, 08:10 PM   #6
WeBeFulltime
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Quote:
Originally Posted by Jersey Devil View Post
Besides being off 4..5 degrees heat or ac turning on the thermostat is a hit and miss.It sometimes takes 15..20 minutes playing with it because it shuts itself on and off as it pleases.Very frustrating.
Also I was told I have heat pump feature with units but says nothing on thermostat?
Normally only one of the units will have heat pump.
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Old 12-06-2017, 08:14 PM   #7
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Quote:
Originally Posted by AZ Traveler View Post
My Dometics are off by 4-5 degrees but work well once we figured out where to set them.
X 2 on off 4_5 degrees my AC tech agree........for 72 I set at 77 not a big deal
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Old 12-06-2017, 08:46 PM   #8
mtlakejim
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Our 381TH has heat pump on both A/Cs and considering how large the unit is that is a very good thing. While there may be some swing in the temp. it doesn't FEEL that way. We won't use the heat much anyway where we live.


You might want to run the fan on low continuously so that you get better circulation particularly past the thermostats. We like to do that on the bedroom unit at night anyway to help us sleep (the A/C noise helps drown out other noises).


I will admit though that the instructions for operation of the thermostats could be a little better. I was fortunate enough to have a friend school me, otherwise it would have taken a while to figure it out. The controls are not the most intuitive but once you learn how they operate it isn't a big deal at all. Yah just have to know the proper sequence to click like a lot of electronic devices......
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Old 12-06-2017, 08:47 PM   #9
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I believe these thermostats probably are cheap, but the reality of it is they work about as well as the top of the line model we had in the stick house. The problem there was that the house, while it was all on one level, was just a hair big for the one thermostat. In the rig the issue is the air leaks and heat/cold leaks and the upper/lower areas on a 5th wheel cause issues of their own. Once I got it figured out things have been fine for us.
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Old 12-06-2017, 09:16 PM   #10
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We are having issues with our air unit in the front. We have a 2017 3661RL. Ours will cut off when it reaches temperature and then not come back on. One of us had to get up every night to cut the blasted thing back on. Spent three days in September trying to get this fixed at Campingworld (where we purchased it). Still isn't right.
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Old 12-06-2017, 09:20 PM   #11
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I think DQDICK hit the nail on the head as far as how the thermostats work. for an rv thermostat they are way better than what comes in a lot of rv out there. their are some good youtube videos to show you how to work the T\stat. It sounds to me like the dealers aren't doing a very good job at the PDI of showing new owners how they work or they don't know either which is more the case!

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Old 12-06-2017, 09:49 PM   #12
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Two Dometic thermostats are off 2 degrees. No problem. Really like the heat pump.
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Old 12-06-2017, 11:29 PM   #13
carl n susan
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You haven't specified which Dometic thermostat you have. The common one I am familiar with is the Comfort Control Center 2 (CCC2). If this NOT the one you have then stop reading now.

In the CCC2 Thermostat O
perating Instructions manual (attached) there are a couple of points of interest.

Page 2
Features
• Liquid Crystal Display
• 2 operation programs
• Outdoor temperature sensing (select models)
• Constant time of day display
• Remote Sensor (Precise comfort control within 1º F. of set-point) <---

Page 7
The system can be configured to operate using an ON/OFF differential of either 1 degree F. or 2 degree F

Further details on choosing between a 1 or 2 degree set point are described later on page 7. .
Attached Files
File Type: pdf Comfort-Control-Center-ii-operation-manual_17586.pdf (1.32 MB, 9 views)
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Old 12-07-2017, 06:49 AM   #14
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Quote:
Originally Posted by mtlakejim View Post
Our 381TH has heat pump on both A/Cs and considering how large the unit is that is a very good thing. While there may be some swing in the temp. it doesn't FEEL that way. We won't use the heat much anyway where we live.
Hmmmmmm...Yours is 1" longer but mine is 6" taller according to Keystone specs. I wonder why 2 HP on yours and I have never seen that before. Our one HP seems to do the job OK though.

OP might want to seal the extra large wire hole behind each thermostat too. I have done that on all 3 Montanas and it does help.
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Old 12-07-2017, 08:09 AM   #15
mtlakejim
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Quote:
Originally Posted by WeBeFulltime View Post
Hmmmmmm...Yours is 1" longer but mine is 6" taller according to Keystone specs. I wonder why 2 HP on yours and I have never seen that before. Our one HP seems to do the job OK though.

OP might want to seal the extra large wire hole behind each thermostat too. I have done that on all 3 Montanas and it does help.
I'll be honest, I don't know if the coach was ordered with two or it is standard equipment. Something else. Yours might be 6" taller by specs at it's tallest point but I bet it slopes down toward the rear end? The 381TH is the same height front to back. There is NO slope to the roof at all! That is of course what makes room for the basement garage. That being the case there is likely as much or more total volume (considering 3 dimensions of cubic air space)? And yes I am concerned about crosswinds with the massive sides of the unit....but that was the trade for the ability to haul toys.
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Old 12-07-2017, 01:35 PM   #16
WeBeFulltime
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Quote:
Originally Posted by mtlakejim View Post
I'll be honest, I don't know if the coach was ordered with two or it is standard equipment. Something else. Yours might be 6" taller by specs at it's tallest point but I bet it slopes down toward the rear end? The 381TH is the same height front to back. There is NO slope to the roof at all! That is of course what makes room for the basement garage. That being the case there is likely as much or more total volume (considering 3 dimensions of cubic air space)? And yes I am concerned about crosswinds with the massive sides of the unit....but that was the trade for the ability to haul toys.
Ours is the same height front to rear because of the raised rear den with massive storage under the den and we don't have to raise and lower our bed to use it. 2 HP is not standard equipment. Apparently you haven't taken a tour of the updated 3791RD.
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