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12-16-2021, 08:20 AM
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#1
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Established Member
Join Date: Dec 2019
Location: McMinnville
Posts: 25
M.O.C. #25477
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Furnace and A/C
2020 3120RL. When we turn on the furnace, it seems to run fine, but the rear A/C unit seems to go on. After the furnace reaches its set temp and turns off, the rear air continues to run. Is this normal?
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12-16-2021, 08:26 AM
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#2
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Established Member
Join Date: Nov 2021
Location: Greenville
Posts: 22
M.O.C. #30180
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I suspect the heat pump is kicking on. If so, that is normal.
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12-16-2021, 08:46 AM
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#3
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Ours will do that if the thermostat is set to auto. For heat, set it for heat. For a/c set it to cool.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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12-16-2021, 08:46 AM
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#4
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Make sure your FAN mode is set to "AUTO".
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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12-20-2021, 07:06 AM
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#5
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Established Member
Join Date: Dec 2019
Location: McMinnville
Posts: 25
M.O.C. #25477
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Another try!
When the furnace comes on, so does the rear a/c unit. Once the air temp come up to the set temp and furnace shuts off, the rear air continues to blow cool air out of the ceiling air ducts. This has never happened before. In the past, once the inside air gets to the desired temp, everything shuts off.
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12-20-2021, 07:21 AM
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#6
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,587
M.O.C. #22835
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As stated above, check your "fan" mode and make sure its on "auto" not set on high or low. High and low settings will cause the AC fan to run constantly, and it doesn't necessarily switch from AC to Furnace. Make sure everything is off to start with. If the fan is running and you attempt to switch, it still might not change. Turn everything off first. Make sure everything quits running first. Then cycle through the fan, furnace, heat pump, settings. When fan come up, put it in auto. Then let everything turn itself on.
__________________
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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12-20-2021, 10:44 AM
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#7
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Montana Master
Join Date: Aug 2015
Location: Mena
Posts: 504
M.O.C. #17723
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Doctor021,
Does your rig have an In-Command unit?
With the In-Command, the Heat Pump/AC unit works as primary heating unit and the gas furnace is secondary.
The settings for Gas ONLY heat are Heat/Gas/Fan(OFF).
Hope this helps,
__________________
Ron & Rhonda
2021 3230CK Montana Legacy w/ Super SolarFlex
(old rig) 2015 Montana 3611RL 8K I.S., Disk Brakes, Sailun Tires
2015 F350 XLT Crew Dually 20K B&W Companion
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12-23-2021, 07:32 AM
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#8
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Montana Fan
Join Date: Jun 2020
Location: Liberty Hill
Posts: 139
M.O.C. #26548
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Quote:
Originally Posted by DoctorO21
2020 3120RL. When we turn on the furnace, it seems to run fine, but the rear A/C unit seems to go on. After the furnace reaches its set temp and turns off, the rear air continues to run. Is this normal?
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It will run continuously if you have it set to fan instead of auto
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Linear Mode
