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Old 02-11-2018, 07:17 PM   #1
Montana Fan
Mikendebbie's Avatar
Join Date: Jan 2018
Location: Austin
Posts: 224
M.O.C. #21044
A/C fan running with furnace?

We have been living full time in our new unit for 3 weeks. We have been using the furnace a lot and the past few days I have noticed the rear A/C runs constantly and (of course) blowing in cold air - I assume cold outside air. We like it cold so we set the thermostat between 55 and 60. The furnace will shut off but the a/c fan still runs. I hypothesized maybe the heat pump function was running and that was why the fan was running. I don’t know if the fan ran during week 1 or 2 - I can’t say that I noticed it. I just noticed this week. I shut the breaker off so the a/c is not running now.

Can anybody tell me if this is normal and proper (yes -the heat pump is trying to supplement the furnace) or maybe yes-the unit is designed to run with the furnace to take in hot air up at the ceiling and circulate it throughout the coach.

If this is not normal then I assume some control wires are crossed in the thermostat somewhere and this needs to be fixed. I appreciate your help and opinions.
Mikendebbie Austin TX - Aggie '77
2014 Chevy 3500 Crew LTZ LB SRW
2018 Montana 3921FB
+ two cute Aussies Gus+Fern
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Old 02-11-2018, 08:46 PM   #2
Montana Master
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Join Date: Jun 2011
Location: Wilsey
Posts: 15,583
M.O.C. #11455
This will happen if the fan speed is set on anything but Auto when you use the furnace. Change the fan speed to Auto and it should function correctly.
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Old 02-11-2018, 09:24 PM   #3
Montana Master
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Join Date: Sep 2017
Location: Tacoma
Posts: 1,198
M.O.C. #20475
You need to set the thermostat to auto and the A\C won't run when the heat is on.
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