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Old 12-14-2015, 08:54 PM   #1
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Dometic thermostat barely works, brand new!

We spent our first night in our FR EVO T2300 - love it!

But since it was freezing cold outside, we ran the heater for a while. I set it to 65F like I would at home. But it just kept running, and running and running... until the kids were frying! So I thought I'd turn it down. No effect. Down some more. Nope. I had to turn it down all the way to 45F to get the heater to stop!

So the 'hysteresis' built into that thing must be way off. Or else the temp gauge must be inside a closet, who knows. Brand new RV, and yes I did check the AC and Heater during our PDI but I certainly didn't check the temperature control range.

What to do? I don't want to go all the way back to the dealer for warranty work. The stock thermostat isn't that great anyway, it only has options for Fan/Heat/AC anyway and doesn't show the ambient temperature. And fan is always on Hi.

Is there a good replacement? Can I used a household thermostat here or must it be a $pecial RV model?

Original looks just like this:

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Old 12-14-2015, 09:10 PM   #2
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I have the same with reasonable results. You can install another type, but it is not plug and play. In other will lose one fan speed. I would order a new one at $40 and get on with it.

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Old 12-15-2015, 09:45 AM   #3
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That's not a thermostat in the strict sense. It's more like a wired remote.

There's only 3 wires between it and the control box in the A/C. To replace it with another type you'll have to replace the control box as well as the T-Stat. You'll also have to replace the 3-wire cable with a 6-wire or 7-wire cable.

I think I'd approach having it fixed under warranty before I tackled that.
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Old 12-15-2015, 09:55 AM   #4
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Here is manual just in case you don't have it......
Attached Files
File Type: pdf Thermostat Single Zone Digital Dometic.pdf (1.40 MB, 133 views)
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Old 12-15-2015, 10:08 AM   #5
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This sounds similar to an issue we had recently when using our furnace for the first time. We have the same thermostat as you with the addition of a "heat pump selection. We found that the ceiling fan would run continuously along with the furnace when connected to shore power or running the generator.

It seems that our fan setting was LO or HI, but you have to have the fan set to "auto" in order to keep the upper fans from running concurrent with the furnace unless you are on 12 volt power. Since you said the fan was constantly running, I was wondering if this is your problem. The cool air from those vents would probably keep the furnace running longer than it should.

We keep it on "auto" all the time.
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Old 12-15-2015, 12:56 PM   #6
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Thanks all! Per the manual it's actually a very featured thermostat - perhaps a little more dumbed down than I would have liked.

I'll try it on Auto mode and see how things go. And I'll try the factory reset as well, maybe that will give it a kick in the pants.
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Old 12-15-2015, 01:37 PM   #7
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Make sure it isn't on Centigrade.
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Old 12-15-2015, 01:40 PM   #8
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Originally Posted by Ke5rbd View Post
Make sure it isn't on Centigrade.
I always make sure mine is not set to centigrade. That's my story and I'm sticking to it!
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Old 12-15-2015, 01:49 PM   #9
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I had same issue with my a/c the first outing. Until I put it on auto the fan would continuously run and cool way beyond the thermostat setting. Once i figured out from dealer how to put it on auto( which owners manual doesn't state) everything works fine
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Old 12-15-2015, 03:13 PM   #10
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did you try the reset that is in the manual?

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