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05-07-2019, 01:56 PM
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#1
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Junior Member
Join Date: Feb 2018
Location: Goldsboro
Posts: 19
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A/C Inop...Advice
A/C issue. Pulled our 2018 Keystone Cougar 27SAB out of the storage lot for our next weekend trip. Testing the systems and found a/c not turning on. Can hear the digital t-stat click ion and show it’s a/c running. No humming so I eliminated capacitors. Battery at 13.2v and I am getting 120 v power to the control box. I ordered a new control box hoping it’s a bad control board. Any other ideas what to test? It’s a Coleman Mach 15 model 48254c869 and a airexcel 8430A633 grill.
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2018 Keystone Cougar Half Ton 27SAB
2017 Ford F250 Superduty 4x4 Diesel
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05-07-2019, 02:42 PM
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#2
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Senior Member
Join Date: Apr 2018
Location: Colorado Springs
Posts: 135
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What kind of power do you have the trailer plugged in to?
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05-07-2019, 05:01 PM
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#3
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Junior Member
Join Date: Feb 2018
Location: Goldsboro
Posts: 19
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Quote:
Originally Posted by wobly
What kind of power do you have the trailer plugged in to?
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30 Amp circuit...progressive EMS shows 120V, plenty of spare Amps, no errors. Receiving 120 Volts power from breaker.
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2018 Keystone Cougar Half Ton 27SAB
2017 Ford F250 Superduty 4x4 Diesel
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05-07-2019, 07:06 PM
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#4
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,337
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Go on the roof and take the cover off. Then give the fan a spin, after that turn the AC on. If it works, your motor seized up. May work for a day may work for years.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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05-08-2019, 01:57 AM
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#5
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Junior Member
Join Date: Feb 2018
Location: Goldsboro
Posts: 19
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Quote:
Originally Posted by chuckster57
Go on the roof and take the cover off. Then give the fan a spin, after that turn the AC on. If it works, your motor seized up. May work for a day may work for years.
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is this a test for the capacitors? fan spins freely when not turned on...will give it a spin with the t-state on ac. while i am up there will check all the power from the controller to the motor with the power on to see if the old controller is bad on the A/C side. if not, I have a new one on order...if its good, I am at the limit of my ability and will call to get it in.
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2018 Keystone Cougar Half Ton 27SAB
2017 Ford F250 Superduty 4x4 Diesel
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05-07-2019, 11:17 PM
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#6
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Senior Member
Join Date: Dec 2013
Location: Great Falls, MT
Posts: 322
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A simple thing to check (don't ask how I know) is to remove the thermostat and ensure good connections on the back. Sometimes, it makes things come back to life miraculously... simple, quick and cheap to check
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2016 Alpine 3601RS
6500 Onan
2016 Chevrolet 2500 LTZ/Z71
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05-08-2019, 02:00 AM
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#7
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Junior Member
Join Date: Feb 2018
Location: Goldsboro
Posts: 19
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Quote:
Originally Posted by shov
A simple thing to check (don't ask how I know) is to remove the thermostat and ensure good connections on the back. Sometimes, it makes things come back to life miraculously... simple, quick and cheap to check
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i lived in great falls for a few years...Malmstrom AFB. I tried connecting the ole t-state that came with the trailer with no luck. new digital connections checked...no luck. will be on the roof today so I will check to see if the 12v power from the t-state is getting to the controller at the a/c...then check to see if power is coming into the capacitors with the t-stat on. I purchased a new controller just in case.
__________________
2018 Keystone Cougar Half Ton 27SAB
2017 Ford F250 Superduty 4x4 Diesel
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05-08-2019, 04:35 AM
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#8
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Senior Member
Join Date: Jul 2013
Location: Liberty, Texas
Posts: 5,034
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Remove the A/C cover inside the RV. Check the wire nut where the wire from the thermostat is connected to be sure the wires are connected and the wire nut is tight. Thermostat wire may be orange/yellow striped.
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2018 Ram 3500 Laramie CC DRW LWB 4X4 Cummins Aisin 3.73
Reese Goosebox 20K
2018 Heartland Landmark 365 Oshkosh
2008 Bigfoot 25C9.4 LB Cabover
2023 CanAm Defender SXS
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