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03-14-2016, 11:26 PM
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#1
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Member
Join Date: Mar 2016
Location: Houston
Posts: 34
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Dometic thermostat
Question about the dometic thermostat.
During our pre-buy, the tech said to run the fan on auto. He said leaving it on low or high could cause the heat and AC to run simultaneously.
My question is, if I want to leave the fan running continuously on low for background noise, how do I set the AC temp/furnace temp to avoid running both or is this not an option? Our tech basically said to leave the fan on auto. I'd hate to have both running at the same time.
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2016 Wildwood 28DBUD/2014 Ram 1500 5.7LHemi
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03-15-2016, 12:58 AM
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#2
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I go RV'ing not Camping
Join Date: Nov 2013
Location: Lethbridge, Ab, Canada
Posts: 1,482
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We just run ours on auto....if you leave it on high or low the fan stays on continuously I prefer it to shut off once it reaches the correct temperature.
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312QBUD Owners Thread
2015 Wildwood Heritage Glen 312QBUD
2000 Chev 2500 Extended Cab 6 Liter
1400lbs Equal-i-zer Hitch
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03-15-2016, 09:24 AM
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#3
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Senior Member
Join Date: Nov 2013
Posts: 1,947
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I think it depends what thermostat you have, there are different models. There is a you tube video if you google Dometic RV Thermostats where a service guy describes exactly what you are saying...we had a thermostat like the one described in the video in our previous trailer and hated it. Current trailer had a different one but we even replaced that one with a digital one that is much more accurate and keeps the temp more constant.
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2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.
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03-15-2016, 09:44 AM
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#4
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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You can just run your fan without heat or air coming on.
Sorry the tech is a dumb a)(!
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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03-15-2016, 10:17 AM
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#5
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,317
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Quote:
Originally Posted by TURBS
You can just run your fan without heat or air coming on.
Sorry the tech is a dumb a)(!
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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No, the tech knew what he was talking about. The heat and AC running at the same time is a pretty common problem asked about on here.
Assuming the OP is just running the fan only, yes you can set it to high or low. But if you have the AC or heat running, the fan should be set to auto.
This may help as well.
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03-15-2016, 10:29 AM
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#6
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Site Team
Join Date: Oct 2014
Posts: 15,292
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Quote:
Originally Posted by Chris82
Question about the dometic thermostat.
During our pre-buy, the tech said to run the fan on auto. He said leaving it on low or high could cause the heat and AC to run simultaneously.
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This is partially correct.
In heat mode, if fan is on hi or low, the AC fan (fan only not compressor) runs to improve circulation.
In AC mode, if fan is on hi or low, the AC fan runs continually and compressor turns on and off as needed. The furnace fan does not run.
Attached is manual
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2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
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03-15-2016, 10:44 AM
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#7
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Dometic thermostat
Yes I know that [emoji12] however you can just run the fan with no heat or a/c ✌️which was my point and I think the op's question.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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03-15-2016, 02:46 PM
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#8
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,317
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Sounds like a right answer/wrong question kind of thing.
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03-15-2016, 03:34 PM
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#9
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Member
Join Date: Mar 2016
Location: Houston
Posts: 34
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Thanks for the responses. Trial and error I suppose.
Not a big fan of the thermostat. Could be a little more intuitive.
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2016 Wildwood 28DBUD/2014 Ram 1500 5.7LHemi
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03-17-2016, 01:28 PM
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#10
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Member
Join Date: Oct 2010
Location: Daleville, AL.
Posts: 82
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My thermostat has a furnace, a/c and separate fan mod. The fan is set to low, high or auto before selecting the operation mode.
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2011 F350 Lariat Ultimate Dually 6.7 w/ B&W Companion
2014 Heritage Glen 356QBQ
2016 Explorer Platinum, 1998 Mustang
1SG(Ret) (1987) US Army Aviation
Days/Nights Camped 2016: 34
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03-17-2016, 09:13 PM
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#11
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Senior Member
Join Date: Nov 2013
Posts: 1,947
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Quote:
Originally Posted by Chris82
Thanks for the responses. Trial and error I suppose.
Not a big fan of the thermostat. Could be a little more intuitive.
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Just change the thermostat out.
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2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.
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03-17-2016, 09:14 PM
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#12
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Member
Join Date: Mar 2016
Location: Houston
Posts: 34
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Quote:
Originally Posted by WFD
Just change the thermostat out.
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I probably will.
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2016 Wildwood 28DBUD/2014 Ram 1500 5.7LHemi
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03-17-2016, 09:26 PM
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#13
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Senior Member
Join Date: Nov 2013
Posts: 1,947
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Many of the factory ones have a large swing in temp variance from when they cycle on and off. We got a new thermostat that has a 1 degree variance so the temp is much more constant.
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2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.
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03-17-2016, 09:55 PM
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#14
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Member
Join Date: Mar 2016
Location: Houston
Posts: 34
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Quote:
Originally Posted by WFD
Many of the factory ones have a large swing in temp variance from when they cycle on and off. We got a new thermostat that has a 1 degree variance so the temp is much more constant.
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Good to know. Thanks for the info. I'll look into upgrading.
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2016 Wildwood 28DBUD/2014 Ram 1500 5.7LHemi
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03-18-2016, 06:51 AM
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#15
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Junior Member
Join Date: Apr 2015
Posts: 29
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Quote:
Originally Posted by WFD
Just change the thermostat out.
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What brands/models would you suggest?
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03-18-2016, 09:46 PM
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#16
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Senior Member
Join Date: Nov 2013
Posts: 1,947
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I stuck with the Coleman/Mach RV brand, but went from an anolog one to a digital one that had the 1 degree variance. Some have used the household ones from Home Depot or Lowe's. Mine was a simple wire for wire exchange and fit exactly as the factory one did...check out Amazon for the Coleman/Mach, that was the best price I found by a long shot.
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2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.
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05-22-2016, 07:29 PM
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#17
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,484
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Quote:
Originally Posted by WFD
Many of the factory ones have a large swing in temp variance from when they cycle on and off. We got a new thermostat that has a 1 degree variance so the temp is much more constant.
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The Dometic is programmable, 1 degree or 2. Default from factory is 2 degrees.
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Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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05-22-2016, 07:32 PM
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#18
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Site Team
Join Date: Oct 2014
Posts: 15,292
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I find that due to the small area and marginal insulation in RVs that 1 degree is too small and causes the AC to cycle to frequently.
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2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
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05-23-2016, 11:31 AM
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#19
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,484
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Quote:
Originally Posted by Flybob
I find that due to the small area and marginal insulation in RVs that 1 degree is too small and causes the AC to cycle to frequently.
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I suppose that is the reason the default is 2 degrees. I've left mine on the default.
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Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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05-23-2016, 11:37 AM
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#20
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by CedarCreekWoody
The Dometic is programmable, 1 degree or 2. Default from factory is 2 degrees.
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It will help if you plug the wall the wires come in at you will like it better. 
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Coachmen M/H
Concord
2018 / 300 DSC
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