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07-04-2012, 02:32 AM
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#1
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Montana Fan
Join Date: Jul 2011
Location: Wichita
Posts: 113
M.O.C. #11612
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2nd air conditioner help
We've been out for about a week with no problems but yesterday noticed bedroom a/c wasn't coming on. Have the dometic controls and checked on mode and zone 2 was on fan but unit not running.
Last night it never came on though zone 1 unit running through duct kept bedroom cool.
I have turned thermostat down to 55 and it still does not run.
Checked circuit breaker and it seems fine.
Any ideas? Thanks.
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07-04-2012, 02:42 AM
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#2
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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You stated that the thermostat was set on fan? It needs to be set to cool for the air conditioner to work. Then you can set the fan (some recommend on high to prevent the ac coils from freezing) depending on outside temps and humidity. If the thermostat will still not start the ac, I would recommend checking if the unit has froze up. You can remove the shroud to check.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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07-04-2012, 03:21 AM
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#3
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Montana Fan
Join Date: Jul 2011
Location: Wichita
Posts: 113
M.O.C. #11612
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I got the fan to run after putting it on that setting. Will that help the coils to unfreeze if that is what the problem is?
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07-04-2012, 03:29 AM
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#4
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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You might consider shutting the AC off for a period of time, that will unfreeze the coils if that is the problem, and then restart.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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07-04-2012, 04:00 AM
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#5
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Montana Fan
Join Date: Jul 2011
Location: Wichita
Posts: 113
M.O.C. #11612
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The ac is off. I just have it running on fan. Should I turn the fan off as well?
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07-05-2012, 06:17 PM
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#6
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Montana Master
Join Date: Mar 2012
Location: Redding
Posts: 1,421
M.O.C. #12339
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Noticed exact same issue this weekend. I am still on the learning curve with both AC units, but was surprised how cool the bedroom stayed with md ship unit running alone. I am very concerned about freeze up with our 115 degree weekends. Set zone one on med fan not automatic and it ran all the time. On auto fan, zone one does cycle but not always. My mid ship unit was having trouble yesterday keeping front LR cool. I put on high fan after shutting off a half hour. Seemed to help. One more trick, we ran front LR fantastic fan on lowest setting and room cooled right down. Think heat builds up in that area and needs venting it also seems to pull cool air forward!
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07-06-2012, 03:46 AM
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#7
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Montana Master
Join Date: Dec 2002
Location: Rapid City
Posts: 739
M.O.C. #77
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Hawkpat,
Having the fan run while the compressor is off will help defrost the unit (assuming that ice coating is your problem). If you can feel air movement with the fan on, then it is probable that your unit is NOT frozen. The ice would prevent any air movement.
It is obvious that you have power available on the unit, so that is not the problem. You might check with Ozz by PM. He is the MOC member who is the most knowledgeable on A/Cs. They are his specialty.
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07-08-2012, 03:51 AM
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#8
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Montana Fan
Join Date: Jul 2011
Location: Wichita
Posts: 113
M.O.C. #11612
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Thanks for all the help. I'm kind of like artemus - new to the unit and working with two ac's. I ran fan for a while then shut it off. When I started it back up it worked fine the rest of the trip. It was hot and humid in San Antonio. Don't know if that contributed.
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07-08-2012, 04:15 AM
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#9
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Never set the fan on low if the AC is running, it will freeze up. Always clean your filters regularly (the green filters under the access panel in front of your air dump) and once a year at least (more if you're near cottonwood trees in the spring) hose your coils on the roof. I have my calendar on my phone set for some of the regular maintenance items such as cleaning the filters, recharging the water softener, etc and that way it doesn't get away from me.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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07-08-2012, 05:03 AM
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#10
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Agree with Dick on the low speed fan
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07-08-2012, 06:02 AM
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#11
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Montana Fan
Join Date: Jul 2011
Location: Wichita
Posts: 113
M.O.C. #11612
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How about setting the fan on auto?
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07-08-2012, 07:13 AM
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#12
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Montana Master
Join Date: Jan 2004
Location: Down the Road
Posts: 5,627
M.O.C. #889
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I've had a 15k btu in the living room and a 13.5k btu low pro in the bedroom for the past 8 years. Last week we had temps into the 108's with a heat index of 116 thanks to the humidity. I always run my a/c units in the "on mode", never on auto during the heat of the day. I also leave the "dump" screen open instead of using the ducted feature. To me using these methods allows the cold air to immediately leave the a/c unit and seems to have helped keep the units from freezing up. So far I've never had an a/c unit quit or freeze up in the past 8 years. At night, I will flip the units back to auto mode just to make sure I dont freeze myself out while sleeping.
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07-08-2012, 08:21 AM
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#13
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Have both of the ducted A/c is the new Big sky set on auto.They have been running all week with temps in the 90's and high humidity.Not a problem.Always ran the 06 on auto..never a freeze up, never a problem.....
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07-08-2012, 10:07 AM
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#14
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Montana Master
Join Date: Jan 2012
Location: Copperas Cove
Posts: 1,426
M.O.C. #12096
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I must be lucky too cause I have never had an AC freeze up. I run my current one on Auto all the time and the bedroom on low, and on my last trailer I would run it on low.
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