Atwood Air Command Air Conditioner Fan Constantly Running Even in Auto Mode

Updated 01/07/2026 | Published 05/29/2019

Question:

I have an Atwood air command unit on an RV I purchased a year ago and no matter if the fan setting is on auto the fan will always run. The compressor will kick off and on once the temperature is reached but the fan never will. The fan will automatically adjust speeds from high/medium/low but never fully turn off. I will attach pictures of the thermostat. Thank you very much!

asked by: Taylor C

Expert Reply:

In cooling mode, the fan does indeed run constantly by design. Since you use the "auto" fan speed, the fan will run at slow speed when the compressor is off, and then cycle up to a higher speed as needed when the compressor starts.

In heat mode the fan does not run constantly. When the compressor shuts off, the fan shut off shortly thereafter as the heat in the cols has dissipated. Then it will run the fan every few minutes on slow to check the air temperature to maintain your temp setting. When the temp is determined to be too cold the compressor with kick on and heat the coils then the fan will kick on so it doesn't circulate cold air but only the warm air.

expert reply by: Jason S

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Randy S.

6/14/2020

I have a Atwood Air Command, on a Class C 2019, the air stops blowing, running, etc during the night, it runs like a champ all day, however some time around 09:00pm it stops running I can change temps, move to Auto, power off and on, it NEVER comes back on, its like it has a timer and no matter what I do it will never come back on during the night, I've bought little fans with us knowing its going to shut off at nights, we are planning a trip to the Beach in July, and fearful that we will be hot during the nights...any advise would be greatly appreciated , I thought it may be freezing, but the fans do not even work

Chris R.

6/20/2020

I reached out to my contact at Atwood to see if he could offer any insight because this is a new one to me. He asked if at around 9:00pm every night a certain appliance or other accessory is turned on. He thinks you may be dealing with some kind of interference issue with the AC unit.

Randy S.

6/22/2020

@ChrisR We first encounter the "problem" during a March outing, the first time we used the Class C RV , i purchased from an older gentleman in November 2019 as indicated its a 2019 Class C, my daughter and grand kids stayed at the Lake and she informed me the next day that the air didn't work that night, not thinking anything of it. However during our outings to the lake the Atwood air has stopped working during some point of the night , 09:00pm - 10:00pm no matter what i do it will not come back on, as I indicated in first email, it works like a champ during 90 Plus degree days, thermostat usually set at 65 degrees. I have ordered a new Atwood 15029 AC Wall Thermostat as well as a new Replacement air filter for the Air Command , should be in next week, thank you for the help, any advise would be greatly appreciated

Chris R.

6/25/2020

@RandyS Thanks for the info. This is a pretty strange issue. There has to be something in the RV on that same circuit that's being switched on or coming on at around that time frame, that's somehow interfering with the AC unit and causing it to shut down. Are you aware of any other appliance that would come on at this time of night?

See All (4) Replies to Randy S. ∨

Nick P.

7/26/2020

I have the same issue. I've diagnosed the issue a little myself. If you hold the "Sleep" button for 5+ seconds, the actual temp will flash on the thermostat. Oddly when my AC doesn't work, the thermostat says the actual temp is often 60-65* even though the inside temp is 70* or higher. I check this with a laser thermometer. This only happens on "cool" for me. If the mode is set to "Heat" the actual temp matches my laser thermometer. Now where it gets really strange but sort of explains the issue. If I put the thermostat mode on on "heat" and point a hair dryer at it, the actual temp goes up like expected so it is reading correct but when the mode is set to "cool" I cannot get the actual temp to change like it did on heat. With the mode set to "cool" I then walk over to the AC unit and blow hot air into the intake duct and BAM the temp goes right up and the AC turns on. I think the issue is that the sensor for the indoor temp is inside the intake duct for the AC. This is a bad design or the wiring is wrong. I am less than 1 week from my Sunseeker 1 year warranty being up so I plan to call the deal tomorrow and get this figured out.

Quinard

1/7/2026

What's the solution if in heat mode and fan in auto mode the indoor evaporator fan is constantly running blowing cold air in ?

Nick S.

1/7/2026

@Quinard That could be a few different things, a faulty thermostat or a stuck fan relay. I would recommend resetting the system by shutting off power to the whole system for a few minutes and after a few minutes turn it back on. Make sure the wiring is all good to and that there are no loose connections. If those basic troubleshooting options do not work I recommend getting an RV or HVAC technician to dig further into the issue.