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12-20-2017, 03:34 PM
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#1
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Member
Join Date: Jun 2010
Posts: 39
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Roof A/C's not working
Well not the compressors at least. The fans will turn on and run separately or at the same time. However, when the A/C function is turned on the fans quit within a few seconds.
All fuses appear to be in good shape.
All HiCurrent fuses (4) are all OK.
All other utilities are working fine.
So, I can't think of what else to check since I'm not a technician. But I can do some rudimentary tests even with a meter.
Would appreciate some thoughts, ideas or advice on how to approach the problem.
Thanks, Mark
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12-20-2017, 06:01 PM
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#2
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Senior Member
Join Date: Jan 2017
Location: Titusville, FL
Posts: 5,164
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Are you plugged into 30A or 50A? Are there other items turned on in the motorhome?
__________________
When seconds count, the police are only minutes away.
2023 Grand Design 2600RB, 2022 F-350 King Ranch tow vehicle, Titusville, FL when not on the road
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12-20-2017, 06:08 PM
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#3
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Senior Member
Winnebago Owners Club
Join Date: Dec 2015
Location: Jacksonville, Fl
Posts: 3,542
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It SEEMS like the energy management system might be shedding the load when the compressors kick in.
So yes, 30 amp or 50 amp, and what else is running, is likely the next thing to check.
__________________
2013 Winnebago Sightseer 36V
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12-22-2017, 09:34 AM
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#4
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Member
Join Date: Jun 2010
Posts: 39
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We're on 50 amp power. I checked all the other utilities and everything is fine. I hesitate to start taking things apart because I know a lot of things can be tied together. But I have to wonder why each A/C would have its own 20 amp breaker and then have other things wired in with it. Could all this be leading to a thermostat issue? Hoping I'm headed in the right direction.
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12-22-2017, 09:43 AM
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#5
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by tmark
We're on 50 amp power. I checked all the other utilities and everything is fine. I hesitate to start taking things apart because I know a lot of things can be tied together. But I have to wonder why each A/C would have its own 20 amp breaker and then have other things wired in with it. Could all this be leading to a thermostat issue? Hoping I'm headed in the right direction.
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Manufacturer and model of A/C and thermostat?
What happens when you run A/C on your generator and disconnect from shore power?
__________________
2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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12-27-2017, 10:59 AM
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#6
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Senior Member
Join Date: Jan 2017
Location: Titusville, FL
Posts: 5,164
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A lot of National RVs incorporate some EMS into the dual A/C control thermostat. Especially dual air conditioner systems in 30A coaches but they also used the EMS thermostat controls in 50A units too.
Thermostat model from the OP would help. A picture of the thermostat would help too.
__________________
When seconds count, the police are only minutes away.
2023 Grand Design 2600RB, 2022 F-350 King Ranch tow vehicle, Titusville, FL when not on the road
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