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Old 07-19-2015, 10:05 PM   #1
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Duo-Therm A/C unit suddenly quit

I have a 2003 Starcraft Aruba travel trailer with a Duo-Therm A/C unit with a 3107541.009 control unit. Unit has always worked great, but occasionally after setting up at the campsite, when I would turn on the A/C, it would not come on. I would remove the ceiling cover and jiggle the clump of wires, and it would come on and stay on for the duration of the trip. So today I decided to open up the cover and check all the wires for a loose wirenut. Turned the unit on, and it started right up. Turned it off to pull out the wires. Discovered a small red wire that looks like it came out of a wirenut. I have no idea where this wire should connect to, and now the A/C will not come on. There is a blue/white wire with a wirenut on it, but no other wire with it. Connect the 2- nothing. The red wire in question comes from a hole on the ceiling framing that also has a little white wire, as well as 2 large red wires and 2 large white wires, green wire, and the wires to the thermostat. When I touch the little red mystery wire to the 2 large red wires, the fan to the unit comes on, but not the condenser. This also happens when I touch the red wire to a wirenut that connects a white wire and a blue/white wire. Touch the wire to all other wirenutted connections, and nothing happens. When I switch the unit from "Off" to "Cool" and back, the condense clicks, but does not come on. Unit was working great until I pulled the wires out to examine them and discovered the mystery wire with a wirenut-ready end connected to nothing. Any thoughts on this?
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Old 07-20-2015, 05:14 AM   #2
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3Stratman When i replaced the control board in my 2000 i took a lot of pictures of the wiring, i'l look and see if i can find anything that may help you.
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Old 07-21-2015, 02:30 PM   #3
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So early Monday morning I'm leaving for work, and I notice that the floodflight on my garage is out. Figured that a breaker in the panel in the garage was tripped, which I knew was also feeding the receptical that my camper is plugged into all the time. No time to check then, but I can when I come home for lunch. Get home for lunch, reset the breaker, and then go into the camper to check. Turn the switch from "Off" to Cool"- comes right on! Have checked several times yesterday and today, and it comes on every time. The floodlight bulb was burned out, so I guess that's what tripped the breaker when it blew out, and it looks like the problem was nothing more than no 120v to the camper and everything running off of the battery. All I know is that the wires are put back, the cover is on, and I'm leaving it alone at this point since all connections are tight and the unit is working.
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Old 07-22-2015, 07:39 AM   #4
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Glad to hear !!!
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