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08-07-2014, 01:07 PM
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#1
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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AC not working
Another AC not working thread. At storage under cover running Oman 8000 generator. Good power on both legs verified on pi 50amp EMS. Turn on AC and set to cool. Front AC cooling fine. Back AC fan working but no cold air. I turned everything off and waited and then turned back on same thing any thoughts
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-07-2014, 01:15 PM
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#2
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Junior Member
Holiday Rambler Owners Club
Join Date: Aug 2014
Posts: 22
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I'm sure you probably did, but did you wait a few minutes before turning it off. Mine takes a few minutes before it kicks in.
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Washtubman
Retired, USAF
2006 HR Vacationer 37PST
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08-07-2014, 02:39 PM
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#3
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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Quote:
Originally Posted by Washtubman
I'm sure you probably did, but did you wait a few minutes before turning it off. Mine takes a few minutes before it kicks in.
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Yes waited and the fan blows but the compressor does not come on. Air come out is the same temp as going back in the return. Both AC's or new installed last year. Worked fine on last trip out.
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-07-2014, 03:00 PM
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#4
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Senior Member
Join Date: Jul 2012
Location: DeLand, Florida
Posts: 464
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You could have a bad connection as the wire that turns on the compressor is different from the one that turns on the fan. it is easy to find a wiring diagram of A/C controls on the web and then check for 12v with a meter. I know this because I had the same problem and found a bad splicing job. Good luck.
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The only thing that always works on a RV is it’s Owner…
2012 Thor Outlaw
2014 Harley Limited
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08-07-2014, 03:09 PM
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#5
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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I agree with cobra. Follow the voltage from the input through to the compressor. Possibly a bad relay or pressure switch (if equipped). You can confirm that the compressor works by running 120 volts directly to it. I would not run it for more than the few seconds that it takes to make sure it runs, in case some safety element has it shut down for a good reason.
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2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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08-07-2014, 03:25 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Jul 2013
Location: Ball Ground GA
Posts: 435
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Check you start capacitor... you have to remove the shroud on top of the motorhome AC unit. you will probably be able to see it.. on mine there are two large capacitors. sitting upright and then down and to the right of them, the smaller start capacitor. It is about the size around as a nickel and maybe 1 1/2" long. When mine went bad it was obvious - was burnt completely into. I think the part is about $12.00. See photo attached.
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[SIGPIC][/SIGPIC]Hugh 'n Deb - USAF Retired B-52 Pilot
2004 Safari Zanzibar 40', F-150, BlueOx TowBar, SMI AF1
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08-07-2014, 03:48 PM
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#7
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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I will check on these tomorrow. Like I say it is new under warranty, but I hate taking it to the RV shop and waiting until they can get to it.
I sure wish I could find a good Mobile RV operation here in the Houston TX area.
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-08-2014, 08:28 AM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,772
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Dumb but, is the temp set well below rig temp. If heat pump equipped reverse and heat then return to cool.
LEN
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2004 Clss C 31' Winnebgo
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08-08-2014, 10:07 AM
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#10
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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Quote:
Originally Posted by OLYLEN
Dumb but, is the temp set well below rig temp. If heat pump equipped reverse and heat then return to cool.
LEN
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Yes I had mode set to Cool and temp set to 71. It was 84 in the coach. I did get on the roof but did not remove the cover and there was no condensation like there was from the front AC. So the compressor was not on.
Just a reg AC not a heat pump.
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-08-2014, 10:14 AM
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#11
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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Quote:
Originally Posted by SteveL1948
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Thanks for the links, I found a mobile RV service Home Page located not very far from my storage. I am going to call them and see if they can come take a look at the AC
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-08-2014, 11:53 AM
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#12
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Senior Member
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,309
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I went back to storage and tried the AC again, still not cooling. I got on top and removed the cover the fan is running and the compressor feels hot to the touch. There is not much else exposed on this new Brisk II unit under the cover.
I checked my PI EMS and with both AC's running I have 118 V on both line 1 and line 2. Line 1 with the front AC is showing 25A usage, Line 2 with the rear AC that is not cooling shows 10 to 11Amps used and stays at that figure.
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Don
2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
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08-08-2014, 03:17 PM
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#13
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Senior Member
Join Date: Oct 2011
Posts: 251
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If they are both still in warranty you may want to take it to a regular rv repair shop. Most mobile guys will not do warranty work; so, you will wind up at least paying a service charge for them to do the diagnosis.
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2011 Monaco Knight 36', MaxForce 10, 350HP, 1150 lbs. Torque.
2008 Saturn Vue Toad, SMI Duo Brake, Roadmaster Sterling Tow Bar
San Antonio, TX Home Port
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08-08-2014, 03:46 PM
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#14
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Member
Join Date: Dec 2011
Posts: 50
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If compressor is hot to touch ur getting power sounds like bad compressor or might be a run capacitor this is what I do for a living an capacitor are known to go out regularly just
FYI A service tech can determine if compressor is pulling lock rotor amps. If not it's a capacitor problem they also can be check with proper tool. Good luck. Hope this helps !
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