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10-22-2021, 09:15 AM
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#1
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New Member
Join Date: May 2021
Location: Box Elder
Posts: 3
M.O.C. #28820
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Heat not working
I have a 2021 3021RL. The heat pump doesn't appear to be working. I can put the AC unit in heat/cool mode but it won't heat no matter how high the call temp is. In gas mode, the furnace turns on for a couple of minutes and then turns off. Any body have any ideas?
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10-22-2021, 11:22 AM
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#2
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,769
M.O.C. #24086
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There is a furnace troubleshooting manual in the files section.
If your furnace blower kicks on for a bit then quits, it could be a sail switch. Especially if you do not hear the igniter clicking outside at the furnace panel.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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10-22-2021, 12:20 PM
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#3
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Established Member
Join Date: Sep 2020
Location: Jefferson
Posts: 16
M.O.C. #27048
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My 2019 3811 thermostat needed to sync with control board. I seen this on YouTube and it works for me. On thermostat push mode button and up button at same time HOLD them until you see 2 bars - - on thermostat then release. Then press mode button to display normal settings This will sync thermostat with control board.
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10-22-2021, 02:37 PM
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#4
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,983
M.O.C. #20477
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Larry,
Only one of your a/c units includes a heat pump - make sure you are trying the right unit.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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10-28-2021, 10:55 AM
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#5
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New Member
Join Date: Jan 2021
Location: Statesboro
Posts: 3
M.O.C. #27993
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My 2021 3855BR Legacy does the same thing. No matter what I do on the rear unit, it always defaults to gas mode. Very frustrating when I would like just to use electricity instead of my propane. If anyone knows of a fix, I would appreciate it.
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10-28-2021, 02:31 PM
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#6
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Montana Fan
Join Date: Oct 2010
Location: Park Hill
Posts: 167
M.O.C. #10841
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On my 2020 3813 command pad I just set rear unit to heat electric and on it comes. If I dont select electric the furnace will come on.
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10-29-2021, 05:55 PM
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#7
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Established Member
Join Date: Oct 2020
Location: Vermilion
Posts: 21
M.O.C. #27220
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Had the same issue with my 3120. It is a board that is bad in the unit. Mine did not work at PDI when I picked it up. Dealer had to order part, and I took it back for them to fix it. It now works.
Paul
__________________
Paul & Erika
2020 F-350 6.7 PSD crewcab DRW, Reese 27k M5 hitch, 2021 Keystone Montana 3120RL Legacy
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10-29-2021, 08:56 PM
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#8
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Established Member
Join Date: Dec 2020
Location: Las Vegas
Posts: 10
M.O.C. #27776
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I am having the same problems but haven't had time to look into it. I have a 2021 Legacy 3791RD with the Super Solar Flex option. I'm thinking I may have the same issues here:
https://www.montanaowners.com/forums...ad.php?t=84020
But I'm not sure if it is really tied to the load shed with the solar. I wonder if to crank these out faster if they might have used the cool only controllers everywhere. Given most owners put the trailer away in the winter, it might not be noticed enough.
__________________
2021 3791RD Legacy in Cobalt w/ Super SolarFlex
2011 F-350
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10-30-2021, 06:24 AM
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#9
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Montana Fan
Join Date: Dec 2020
Location: STUARTS DRAFT, VA
Posts: 140
M.O.C. #27830
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Quote:
Originally Posted by Larrysnyder
I have a 2021 3021RL. The heat pump doesn't appear to be working. I can put the AC unit in heat/cool mode but it won't heat no matter how high the call temp is. In gas mode, the furnace turns on for a couple of minutes and then turns off. Any body have any ideas?
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Had the same problem. Our dealer told us to replace the 15 amp self-resetting circuit breaker (it's dark grey in the fuse panel) with a 20 amp fuse. No more problems. Furnace works great.
__________________
John and Carrie
2021 Montana 3121RL Legacy
2020 F-250 Lariat 4X4 Short 3.55
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10-30-2021, 08:09 AM
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#10
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,160
M.O.C. #1920
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Larry, did you get it working? One thing about the heat pump. If there is more than 3 degrees difference between inside temp and the set point, it will run gas until it is within the 3 degree setting. I believe the reason for that is as the temp gets colder, the heat pump becomes less efficient and will eventually stop heating. This is just a safety in case you have the heat pump running, you’re away and the temp drops. Your unit will still stay warm.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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11-01-2021, 09:28 AM
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#11
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Established Member
Join Date: Sep 2021
Location: Chaska
Posts: 11
M.O.C. #29693
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This Worked On Mine Also
Quote:
Originally Posted by jjwhite368
Had the same problem. Our dealer told us to replace the 15 amp self-resetting circuit breaker (it's dark grey in the fuse panel) with a 20 amp fuse. No more problems. Furnace works great.
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This fixed the problem with mine also. Just swapped out the grey 15 amp resetting fuse with a yellow 20 amp fuse and good to go now.
2021 3791RD
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11-04-2021, 06:58 AM
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#12
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Montana Fan
Join Date: Jan 2019
Location: TROY
Posts: 133
M.O.C. #23248
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I have a 2019 3120RL, the rear thermostat has separate modes for heat pump and furnace. The furnace will only work if the furnace mode is selected. So mine does not switch. If the temp drops too low (like overnight) while set to heat pump mode, it will blow cold air.
__________________
2019 20th Anniversary Edition 3120RL
2019 3500 Silverado HC, SWR, Duramax
B&W 20K for GM OEM Puck
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11-04-2021, 07:51 AM
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#13
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,160
M.O.C. #1920
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I am curious now, since you have separate modes, do you have In-Command? Trying to understand if the gas/electric is an In-Command feature or a change they made in the last few years. The way it works on our 2021 Legacy with In-Command is you select heat, then select electric or gas. If you select electric, if there is more than three degrees between set and actual, the gas furnace comes on until it is within three degrees. Then it switches back to electric. This works nice when it is borderline for the heat pump. So, is this a change by year of manufacture or is it relative to the In-Command?
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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11-04-2021, 08:29 AM
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#14
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Montana Fan
Join Date: Feb 2020
Location: BUZZARDS BAY
Posts: 117
M.O.C. #25753
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Best thing I did was throw all those crap thermostats away and replaced them with Micro Air units. No more issues and I love being able to turn the heat or ac on from my phone and have everything nice and cozy before we get back!!
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11-04-2021, 09:10 AM
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#15
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,160
M.O.C. #1920
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Bob, ours (through In-Command) allows us to do that already. This is the most consistent temp of all of our Montana’s. I agree, it is nice to have control/monitoring of the RV from the phone, including lighting. Adding some WiFi plugs, a Blink camera and an Alexa adds to our livability.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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11-04-2021, 11:15 AM
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#16
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Montana Fan
Join Date: Jan 2019
Location: TROY
Posts: 133
M.O.C. #23248
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My 2019 3120RL is the "20th Anniversary" edition. It was assembled in October 2018. We purchased it in January 2019. Montana did not offer the incommand system at that time., though some other Keystone brands did.
At the dealer walk through, I was told the HP would automatically switch to the Furnace when it got too cold. It does not.
__________________
2019 20th Anniversary Edition 3120RL
2019 3500 Silverado HC, SWR, Duramax
B&W 20K for GM OEM Puck
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11-14-2021, 12:47 PM
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#17
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Established Member
Join Date: Dec 2018
Location: Colorado Srpings
Posts: 23
M.O.C. #23142
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Where to get a sail switch for the furnace
Hello all,
I had a similar issue with my furnace and was able to determine the problem is the sail switch. I found one on Amazon: Dometic 33082 Svc Df Sail Sw W/Brkt M/L Kit, for $30. Is this a reasonable price or have others found a better price through a local or online seller?
Thanks!
Michael
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