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Old 06-25-2021, 12:00 PM   #1
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No Rear Air

My rear air unit has decided not to come on. Front working as it should.
I am parked, shore power 50amp service, and been here for a few days so it's not anything related to just hooking up. I have a Progressive Power Guard plugged into the pedestal and it shows okay.

I left the rear on for a 3 hours or so while running errands yesterday afternoon and when I came back noticed the coach seemed warm and the rear air wasn't running.


At the thermostat,
I turned on zone 1 (front air) and it started as normal w 180sec delay

I turned off zone 2 (rear air) and turned it on again but of course, rear air won't start or run.

My rear air is on Line-1 and shows 119v/120v and drawing 5amps
Front air is on Line-2 and shows 119/120v and drawing 13amps w the air on.
I am certainly not an electrician and I am kind of at a loss of what to check next. Any advice will be appreciated.
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Old 06-25-2021, 12:18 PM   #2
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Willing to bet it is a capacitor easy chafe out a DIY project. See if RV dealer is around you.
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Old 06-25-2021, 12:20 PM   #3
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Is one of the two 50a breakers tripped or turned off in the cabinet?
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Old 06-25-2021, 12:39 PM   #4
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Is one of the two 50a breakers tripped or turned off in the cabinet?
I would hope not. They are to be linked together so both trip.
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Old 06-25-2021, 12:46 PM   #5
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Quote:
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Is one of the two 50a breakers tripped or turned off in the cabinet?
Nope nothing tripped. But thanks
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Old 06-25-2021, 12:58 PM   #6
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Willing to bet it is a capacitor easy chafe out a DIY project. See if RV dealer is around you.
I am leaning towards a bad capacitor as well.
I'll see whats available in this area.
Thanks
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Old 06-25-2021, 01:56 PM   #7
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Do you have an EMS that load sheds? I am aware of the load shed relays failing on the intellitec board. Test for power out of rear A/C beaker to load shed relay on Intellitec board and power out of relay to rear AC.
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Old 06-25-2021, 03:32 PM   #8
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I just came off the roof and I now believe it is the fan capacitor.
I turned it on, it was "humming". I started it with turning the fan with my hand. Cooling away now so, thanks to you all for your advice & suggestions.
I'll swing by somewhere and pick one up.
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Old 06-26-2021, 07:08 AM   #9
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While you are up there I would change the start capacitor and the run capacitor. There may be a 3 amp fuse to keep a eye on. When I changed mine out the 3 amp fuse was blown. I don't know if I caused that or not.
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Old 06-27-2021, 11:24 AM   #10
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Could be the capacitor it could also be a bad fan motor winding. Did the fan spin easily and not drag in its bearings? Just two other reasons for the motor humming and failing to rotate. The capacitor is a good place to start.
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Old 06-29-2021, 10:54 PM   #11
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If I may add a question to this thread. Having a similar but different problem with my rear Duo Therm roof mounted A/C. Rear unit starts but does not blow cold air. Front unit Zone 1 works correctly, Rear unit Zone 2 when set to "cool" fan starts drawing about 5 amps. After normal delay current draw jumps to 10 amps, but no change in unit sound and no cold air regardless how long I let it run. Front unit starts out with about 6 amp draw with fan running and after delay current draw jumps to 12 amp with noticeable change in sound from unit and cold air from unit and vents. Where do I begin to look for solution to problem. Am fairly DIY capable, but not that familiar with these units.
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