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Topic: Roof Air Problem. (Read 637 times) previous topic - next topic

Roof Air Problem.

Rear of coach Carrier Low Profile 13.5 A.C. , new in 2011, not giving cooling, fan working, but not in the front outlet or bottom. Any clues where to start? (I am not allowed on the roof). Screens are clean.
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: Roof Air Problem.

Reply #1 –
First thing Google " Carrier RV Roof Air"  there is a full up manual there for free. Can you hear the compressor running in the roof pack? Find your 120v breaker panel and reset all AC breakers.  Be sure that your wall/unit thermostatic is calling for cool. There might be a fuse in the ceiling unit that is blown, check that. 
1988  40' Grand Villa Cat 3208t

Re: Roof Air Problem.

Reply #2 –
Mike, with any roof A/C, you need to find someone to go up, remove the cover and then access the electrical area.  Loose wires, bad capacitors, bad relay, etc well outnumber compressor or other major failures.

Do you hear the thermostat "click" when you rotate it cooler (i.e. it is sending the "start compressor" signal)?
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Roof Air Problem.

Reply #3 –
At least from inside look up above filter and see if the coil surface is dirty, as all cooled air has to flow through the coil.  This may not be the 'problem' but it is something you can do without being on the roof.  Vacuum the dust on the visible wires and connectors can't hurt either.

Re: Roof Air Problem.

Reply #4 –
Thanks all, will do some poking around today (after my NASCAR fix).  ^.^d  Having never stayed here, I don't have a tech I trust and will do some research. I've never seen Carrier out here, but as the saying goes: "Roof Air is Roof Air".
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: Roof Air Problem.

Reply #5 –
Monster Mile!!!

Maybe I should start a NASCAR thread and not hijack this one.
🤓
Tim Fiedler    2025 LTV Unity MBL on Order
2000 Chevy Tracker 2 Door Convertible 4WD Now lifted 4.5"
1985 Citroen 2CV6 Charleston
Murphy Rebel on wheels with 175HP Titan
Cessna P337
1980 48' Westport MY (!/4 Share)

Re: Roof Air Problem.

Reply #6 –
Interesting: Pulled both screens and took them outside and cleaned them with a toothbrush, they were dirty!  Rotated the temp control back and forth (had felt some binding yesterday). Fired it up, rotated the temp from zero to full cool,  the compressor came on, and, Houston, we have cooling!  ^.^d  (Fingers crossed, summer is coming).
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: Roof Air Problem.

Reply #7 –
Mike,

Is that a mechanical type switch that could benefit from some contact cleaner?  DeoxIT (Radio Shack) is good stuff!  8)
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"
 

Re: Roof Air Problem.

Reply #8 –
Quote from: Chuck & Jeannie –
Is that a mechanical type switch that could benefit from some contact cleaner?  DeoxIT (Radio Shack) is good stuff!  8) 
Very well could have been the lag. Thanks!
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'