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11-11-2022, 10:59 AM
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#1
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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Preventing AC from running in fan mode
Greetings Fellow RV'rs,
I have a 2020 Micro Minnie 2108DS When connected to "shore power" and using the propane heater, the AC fan kicks on to circulate air. The problem is, the AC fan is very loud and the circulating air doesn't do much. On DC power, the heater works great and is relatively quiet, and obviously the AC fan won't run.
Here's my question: Can I simply turn the breaker off for my AC unit when I'm connected to shore power so my heater will run and the fan on the AC unit won't?
By the way, on my thermostat there is; Off, Fan, Heat and Cool - so no way to turn it off there.
Thanks!!!
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11-11-2022, 11:10 AM
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#2
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Site Team
Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 7,780
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Hi and welcome!
Can't you simple turn off the A/C with the thermostat? I'm sure you could turn it off at the breaker but doesn't the thermostat offer that option?
__________________
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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11-11-2022, 11:46 AM
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#3
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Winnebago Master
Join Date: Nov 2018
Location: Pflugerville/Austin, Tx
Posts: 7,368
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Unless somebody has done something really " creative ", I would say there is a thermostat or wiring error!
But then I've also spent the last four hours trying to find and fix an "update" on my computer! Some folks just won't leave things alone!
__________________
Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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11-11-2022, 04:40 PM
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#4
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Winnebago Master
Join Date: Nov 2018
Location: Pflugerville/Austin, Tx
Posts: 7,368
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Can you take a peek at the thermostat to tell us what brand and model you have. That will allow us to look at the wiring and plans for it.
Electronics is a minefield on new products, so knowing which you have is important to get the right ideas.
__________________
Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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11-12-2022, 06:50 AM
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#5
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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All my thermostat allows for is selecting: Off, Fan, Heating, Cooling and then of course, temperature setting.
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11-12-2022, 06:53 AM
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#6
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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I called Winnebago when the trailer was brand new and was told that was normal operation as the "AC fan helps to circulate the heat" In reality, it blows the air so danged hard that it feels like cold air blowing around. The Thermostat is very basic, I'll look for a manufacturer and model. Thank you.
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11-12-2022, 07:12 AM
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#7
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Site Team
Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 7,780
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We have a lot of members with this travel trailer, but this is the first time I can remember seeing anyone mention this “feature.”
__________________
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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11-13-2022, 05:59 AM
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#8
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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Yes, it seemed odd to me as well, that's why I called - I was still under the one year warranty. Now that I'm back home from my latest trip, I'll do some digging on the thermostat manufacturer and double check to look for a menu on the thermostat that I haven't seen.
Ultimately, I don't believe turning off the breaker for the AC would cause any problems, and when I'm running heat I won't be running AC, so I wouldn't need to turn the AC breaker back on repeatedly.
Thanks!
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11-13-2022, 07:11 AM
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#9
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Winnebago Master
Join Date: Apr 2018
Location: Tucson, AZ
Posts: 1,196
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Just a thought here, is the same thermostat used for heat and cool or does the furnace have it's own stat? Also by any chance is your AC unit also a heat pump?
My MH has a heat pump and a propane furnace, and one thermostat for heat or cool. When using the heat pump the propane furnace will fire up at the same time
until the room temp reaches within 1 or 2 degrees of the set point, then the propane furnace will shut down and the heat pump will continue to provide heat as long as the room temp does not drop more than 2 degrees from the set point. The air coming from the heat pump is luke warm compared to the floor vents from the furnace and I can see where it might be assumed only the fan is running.
The difference is my thermostat lets me choose gas or electric heat, in gas mode neither the heat pump or the fan will run but in electric mode both will run initially.
__________________
Brian
2011 Winnebago Via 25Q on 2010 Sprinter Chassis
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11-13-2022, 09:35 AM
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#10
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Winnebago Owner
Join Date: Oct 2020
Location: Asheville, NC
Posts: 1,651
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Maybe WBGO changed the thermostat model, but my Dometic has: heat-cool/fan/auto/off. When in auto mode, the roof fan will operate with furnace on. But the fan can be set to off. If your thermostatic annoys you, it is easy to replace it.
__________________
Jim. Former, 2021b Micro Minnie 2108DS
Medically grounded, but still lurking the Micro Minnie Discussions
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11-13-2022, 02:43 PM
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#11
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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Well, I did discover that my fan was on High. It has two speeds, high and low, so I put it on low. It is a Dometic thermostat, but as mentioned before, it only has: Off, Heat, Cool, and Fan modes - along with desired temp setting. Shutting off the AC breaker solves the problem, so time to move on to bigger stuff. Thanks for all the input!
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11-16-2022, 04:37 PM
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#12
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Winnebago Watcher
Join Date: May 2018
Posts: 4
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Quote:
Originally Posted by gamewarden
Greetings Fellow RV'rs,
I have a 2020 Micro Minnie 2108DS When connected to "shore power" and using the propane heater, the AC fan kicks on to circulate air. The problem is, the AC fan is very loud and the circulating air doesn't do much. On DC power, the heater works great and is relatively quiet, and obviously the AC fan won't run.
Here's my question: Can I simply turn the breaker off for my AC unit when I'm connected to shore power so my heater will run and the fan on the AC unit won't?
By the way, on my thermostat there is; Off, Fan, Heat and Cool - so no way to turn it off there.
Thanks!!!
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Read the Dometic manual closely. I had the same problem first time out in my 2022 Winnebago Micro Minnie 2108 FBS, but found that if you toggle the fan to "Auto" mode rather than Low or High, then the AC fan does not come on with the heat. The bigger problem on mine is that the thermostat is right over the heat, so the setting is very skewed. And then the furnace stopped igniting while we were out in freezing weather... Apparently an electronics problem, not fixed yet.
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11-17-2022, 07:55 PM
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#13
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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Thank you! I'm off tomorrow so I'll give that a try.
Jim
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11-18-2022, 06:03 AM
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#14
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Winnie-Wise
Join Date: Apr 2017
Location: South Central, Pennsylvania
Posts: 443
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Quote:
Originally Posted by gamewarden
Thank you! I'm off tomorrow so I'll give that a try.
Jim
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Jim, this video explains how a Dometic single zone thermostat works. Hopefully your thermostat is similar.
__________________
2016 Winnebago Micro Minnie 2106DS, 200Ah BB, 400w rooftop & 500w front cap solar
2020 Tundra SR5 DLCB TRD Off Road, 5.7L V8 w/6.5' bed & 38 gal. tank, 4.30 axle ratio
Blue Ox Sway Pro w/750# bars, wired RVS rear view camera, Renogy 20A DC/DC charger
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11-18-2022, 02:09 PM
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#15
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Proud “No Intent” Owner
Join Date: Jul 2019
Location: Belmont, CA
Posts: 1,772
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On mine, there are the ceiling fan/A/C controls below the heat, icon control. The idea being that you can run the heater and it will come out the vents in the floor, and also turn on the ceiling fan to circulate the heat, or not.
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11-18-2022, 07:02 PM
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#16
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Winnebago Master
Join Date: Aug 2001
Location: North America somewhere
Posts: 2,039
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Quote:
Originally Posted by gamewarden
All my thermostat allows for is selecting: Off, Fan, Heating, Cooling and then of course, temperature setting.
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I read in this you have your thermostat in the "off" position? If that is correct, simply flip the breaker to "off", that way it's impossible for the fan to run. It cannot harm anything.
I'm assuming the factory design for running the fan is to circulate and distribute hot air near the ceiling down towards the floor. That may be easier accomplished with a small portable fan.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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11-24-2022, 06:41 AM
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#17
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Winnebago Camper
Join Date: Nov 2022
Posts: 14
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Thanks, that what I ended up doing. I learned a lot from all the great comments but this is the only way I found, with my particular thermostat, to prevent the fan from running when the furnace is on and I'm plugged in. Happy camping! Jim
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