Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×

Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > MOC Technical Forums > Montana Problems, Problem Solving & Technical Help
Click Here to Login

Thread Tools Search this Thread Display Modes
Old 02-11-2018, 06:17 PM   #1
Montana Master
Mikendebbie's Avatar
Join Date: Jan 2018
Location: Austin
Posts: 2,192
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 Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
Mikendebbie is offline   Reply With Quote
Old 02-11-2018, 07:46 PM   #2
Site Team
DQDick's Avatar
Join Date: Jun 2011
Location: Wilsey
Posts: 18,792
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.
DQDick is offline   Reply With Quote
Old 02-11-2018, 08:24 PM   #3
Montana Master
BuilderBob's Avatar
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
You need to set the thermostat to auto and the A\C won't run when the heat is on.
BuilderBob is offline   Reply With Quote
Old 03-20-2023, 03:32 PM   #4
New Member
Join Date: Mar 2023
Location: Victoria
Posts: 1
M.O.C. #32485
Sorry to sound dumb, but how do I set te fan to auto? I dont see anywhere that I can do that. Thanks, rvdn.
Rvdan is offline   Reply With Quote
Old 03-20-2023, 03:49 PM   #5
Montana Master
jsb5717's Avatar
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,337
M.O.C. #23668
Originally Posted by Rvdan View Post
Sorry to sound dumb, but how do I set te fan to auto? I dont see anywhere that I can do that. Thanks, rvdn.
Welcome aboard! We’re glad to help but need a little more info. What year and model of trailer do you have? Do you have a picture you can post of the thermostat?
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
jsb5717 is online now   Reply With Quote
Old 03-27-2023, 01:48 PM   #6
Established Member
Join Date: Jun 2016
Location: Orlando
Posts: 47
M.O.C. #18705
Should be on the thermostat
Ken and Sheila
2014 HM318RE
Pocketlake1 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.

All times are GMT -6. The time now is 04:12 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2023, vBulletin Solutions, Inc.