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04-15-2022, 12:22 PM
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#1
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Established Member
Join Date: Apr 2021
Location: Baker
Posts: 17
M.O.C. #28648
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AC Repair/Replace
I have a Montana 3813MS that we are having trouble with one of the rooftop units. The only manual I have is for an Airxcel for 48000 heat pumps. There are no manuals to tell me the brand of AC Unit. Toward the end of last summer the AC stopped cooling. Also, the one time we tried to use the heat pump because we ran out of propane, the heat pump would not heat the trailer. I would like to replace the unit, but I don't know what to buy. Is the only way I can find out is to climb up onto the roof?
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04-15-2022, 12:33 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,690
M.O.C. #4831
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Apparently you have a 2021 model according to your profile. I am not sure if Montana was using the Coleman units then or not. Maybe another 2021 owner will know.
But if the AC doesn't work, neither will the heat pump. The heat pump is simply running the AC backwards by capturing the heat from the compressor rather than the cool air.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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04-15-2022, 01:13 PM
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#3
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,571
M.O.C. #23668
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The easiest way for me is to get on the roof and pull off the cover. Then you can capture all of the tags and numbers and start looking them up.
__________________
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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04-15-2022, 01:22 PM
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#4
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Established Member
Join Date: Apr 2021
Location: Baker
Posts: 17
M.O.C. #28648
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Thanks. I was trying to avoid going up on the roof, but it appears there is no other choice.
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04-15-2022, 03:39 PM
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#5
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,897
M.O.C. #24086
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I have a 2019 3130re.
This is my front unit. I took pictures of the numbers while installing a SoftStartRV.
I'm don't know if the rear unit is different. The front is AC the rear is a heat pump.
I haven't taken the cover off the rear one to see.
Dometic air conditioner part number, front H541916A721JD
SKU. 9105305954 **
15000 BTU
https://www.dometic.com/en-us/outdoo...-nxt-15k-28977
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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04-16-2022, 06:35 AM
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#6
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 965
M.O.C. #17801
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It's likely a Dometic and yes, you have to remove the cover to find the nomenclature. While you're up there, look for loose or corroded electric terminals as it might be an easy fix. Someone also told me to check the sensor on the cooling fins.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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04-16-2022, 08:14 AM
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#7
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 446
M.O.C. #26015
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Mine did that last summer, it leaked all the juice out. Replaced it with a new unit, cost about 1400$ for a new one.
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04-16-2022, 08:46 AM
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#8
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,361
M.O.C. #6433
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And remove the cover carefully. I replaced a broken cover for a friend who was not physically able to climb on his roof. When I pulled the cover off, a swarm of wasp came flying out from a nest within. No place to go, at least not quickly. Friend tossed up a can of wasp spray and I somehow managed to kill them all without getting stung. Funny now, not then.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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04-20-2022, 01:27 PM
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#9
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New Member
Join Date: Oct 2017
Location: Era
Posts: 7
M.O.C. #20764
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I think Dometic has a 2 yr warranty. It doesn't hurt to contact them. My ac/heatpump quit cooling and I contacted Dometic even though my unit was 2 months out of warranty and Dometic replaced it.
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04-20-2022, 04:10 PM
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#10
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,038
M.O.C. #5651
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I needed info from my A/C and I was able to get it by taking off the inside cover. Found a tag with the S/N and some other info too inside.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-20-2022, 10:17 PM
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#11
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Established Member
Join Date: Aug 2021
Location: Roseville ca
Posts: 28
M.O.C. #29445
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Quote:
Originally Posted by Muhldeer
I have a Montana 3813MS that we are having trouble with one of the rooftop units. The only manual I have is for an Airxcel for 48000 heat pumps. There are no manuals to tell me the brand of AC Unit. Toward the end of last summer the AC stopped cooling. Also, the one time we tried to use the heat pump because we ran out of propane, the heat pump would not heat the trailer. I would like to replace the unit, but I don't know what to buy. Is the only way I can find out is to climb up onto the roof?
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We have a 2021 Montana CK 3231, manufactured early 2021 with three Coleman AC’s. The rear unit is a heat pump. Ours has worked fine, sorry that your having a problem with yours. Your unit is a 2021, are you still under warranty? If so have your dealer fix it.
Safe travels Steve
__________________
Steve & Sheryl
2021 Montana 3231 CK full body paint (Sterling)
300 watt solar, 3 air conditions, Slide out toppers
2015 GMC Denali 3500 SRW CC SWB
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04-21-2022, 07:39 AM
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#12
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,183
M.O.C. #1920
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I am just curious, if you have a new unit why didn’t your dealer fix or replace under warranty. If you have the AirExcel manual you have the Coleman AC. There are some things to know about the heat pump portion (which likely isn’t working if the AC isn’t). First, the heat pump only works when it is within 3 degrees of the set point. So, if you set it at 72 and it’s 65 in the trailer, the heat pump won’t start until it’s 69 inside. Second, when on gas heat and fan on auto, the heat pump fan will run to keep air moving inside. Best of luck getting your unit working. We have two of the Coleman units on our 2021 3230CK and they work great.
__________________
Ron and Terrie Ames plus Meg - 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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