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03-08-2023, 07:42 AM
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#1
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New Member
Join Date: Mar 2023
Location: Minneapolis
Posts: 3
M.O.C. #32433
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Dometic Thermostat Mind of it's own ?
So we've got a 2019 Montana 3721RL and recently our thermostat when set to call for heat will not only start the furnace but the rear roof top a/c unit kicks on same time. In fact the rear a/c unit doesn't appear to cycle the a/c at various temps when cooling. Anyone else experience the same nonsense ?
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03-08-2023, 07:50 AM
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#2
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Montana Master
Join Date: May 2020
Location: UPLAND
Posts: 1,256
M.O.C. #26190
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Now is a great time to upgrade to the digital touch screen Micro Air thermostats. You can control them with your phone off bluetooth or wifi. One of the first upgrades we did on our 2019. We were having problems with the factory ones too.
__________________
2019 Keystone Montana 3560RL, 2020 Chevy 2500 HD, Firestone airbags, Air Lift wireless compressor, Curt gooseneck, 20K Reese Goosebox, TST-507, USMC combat vet & retired LEO. Robert, Anika, Breanna, Dylan (daughter-in-law Stephanie). & our Great Pyrenees Layla
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03-08-2023, 08:42 AM
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#3
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New Member
Join Date: Mar 2023
Location: Minneapolis
Posts: 3
M.O.C. #32433
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Thank you so much for thje recommendation. We'll check them out !
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03-08-2023, 08:43 AM
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#4
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,469
M.O.C. #23668
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The Dometic Thermostats are known to be glichy. It's possible that the Tstat isn't root cause of your current symptoms but it could well be. One thing to try is to remove the cover and then operate it. May or may not help but some have said that it works better. If it does then you know it's the Tstat.
As Bartman said, maybe just bite the bullet, as many of us have, and get the MicroAir Thermostat. A little spendy, sure, but I haven't regretted getting one. So much better and easier to use.
https://www.microair.net/collections...c-replacements
Welcome to the forum! Let us know how it goes.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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03-08-2023, 08:56 AM
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#5
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,585
M.O.C. #22835
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Cycle through the thermostat and make sure you do not have it set to "fan", but it is set on Auto. When you have it set on "fan" first, and then turn the furnace on, the AC will continue to blow also. Although, it's just blowing air, not actually cooling.
If you flip it to AC then, the fan will continue to run and the AC compressor will cycle on and off. It's designed to do this.
So, make sure you are in the "Auto" setting an not "Fan" setting. See if that helps. If not, we'll go to "Step 2" next.
__________________
Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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03-08-2023, 10:46 AM
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#6
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Montana Master
Join Date: Jan 2018
Location: Austin
Posts: 2,415
M.O.C. #21044
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x2 on MicroAir T-stats.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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03-08-2023, 03:09 PM
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#7
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New Member
Join Date: Mar 2023
Location: Minneapolis
Posts: 3
M.O.C. #32433
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Thank you for the insight and I'll give that a try while we await our new Micro Air T-stat,
Side note How do you like your front living model?
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03-08-2023, 04:46 PM
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#8
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,219
M.O.C. #30417
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Those thermostats have a foam insert used for the keys. Over time they deform and make contact causing all kinds of wonky problems. Upgrade!
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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03-12-2023, 02:49 PM
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#9
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Seasoned Camper
Join Date: Jul 2016
Location: Santa Rosa Beach
Posts: 60
M.O.C. #18757
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Sounds like it just needs a thermostat reset.
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 on. This may cure your problem
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03-12-2023, 09:10 PM
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#10
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Seasoned Camper
Join Date: Aug 2019
Location: Monument
Posts: 97
M.O.C. #24683
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Us too. Micro-Air replacement works great.
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Linear Mode
