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09-26-2021, 06:13 PM
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#1
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Montana Master
Join Date: Jan 2018
Location: Austin
Posts: 2,423
M.O.C. #21044
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Heat pump comes on - not the furnace
Our rig has not been used for its intended purpose since COVID shut down. We are headed out in October. We recently had a 50 amp outlet installed and I have been playing with things out in the RV. I have noticed that when I scroll thru the thermostat settings and try to get the furnace to fire up - the roof unit starts blowing and I assume it is the heat pump coming on. I am not sure what to do to get the furnace fired up and not have the heat pump. Looking for suggestions so I can fix it now well before we will need the furnace.
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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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09-27-2021, 05:27 AM
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#2
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Established Member
Join Date: Apr 2018
Location: Shiloh
Posts: 40
M.O.C. #21545
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I have the same issue so I turn off the aircon/heat pump at the breaker switch.
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RK & Jen
2018 3790RD
2017 F350 DRW
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09-27-2021, 06:22 AM
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#3
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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Is the thermostat fan set to auto or low/high? If on low or high, the fan will run whether the ac or heat pump is on or not. When you scroll through the modes, set fan to auto instead, then go to furnace for heat.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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09-27-2021, 08:42 AM
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#4
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Montana Fan
Join Date: Mar 2021
Location: Western NY
Posts: 491
M.O.C. #28430
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On ours, I scroll until I get to "heat - gas" for the furnace only.
"heat - elec" for the heat pump. If I set it for heat elec and the temperature differential is 5 degrees or more between the thermostat setting and the air temperature in the trailer, it automatically switches to gas to bring the temperature up quicker, then maintains it with just "heat - elec" (the heat pump)
Not sure if yours may be the same.
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Mark & Karen
2021 3121rl - slide toppers, cottage white, TST 507 TPMS, X-Factors, disc brakes
2021 F-350, 6.7L, SRW CC LB - B&W Companion, Bakflip cover
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09-27-2021, 11:13 AM
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#5
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Montana Master
Join Date: Jan 2018
Location: Austin
Posts: 2,423
M.O.C. #21044
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RMcNeal - now that you mention it - the fan was set to HIGH. I will go back out and try the auto setting...thankyou!
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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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09-28-2021, 05:19 AM
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#6
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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I did the same thing before I changed out the Dometic thermostats for the Micro Air. I was running AC with fan on high to prevent the freeze lockout.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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10-03-2021, 02:52 PM
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#7
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Established Member
Join Date: Jan 2020
Location: Bad Axe
Posts: 26
M.O.C. #25648
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Mine did the same thing this last week. Some how the switch on the furnace (behind the outside access panel) was turned off. Its a possibility that switch might have went bad or is turned off like mine.
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Linear Mode
