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Old 05-20-2019, 09:49 PM   #1
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Join Date: May 2014
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07 Designer A/C problems

Well, after two season without A/C, I got after the issue.

Problem was A/C not cooling, after winter storage. Not having more than a 20 amp circuit to test the A/C system, can be quite tedious.

I first thought it may be wiring, checking wires at the relay board and T-stat, I found poor connections and wires breaking upon movement.

I repaired the poor connections, and retested the system. still no A/C cooling.

So I jump the A/C compressor relay, the compressor kicks on, and I blow the 20 amp circuit. OK I gave up on season 1 with no A/C.

Season 2 only two Trips, with cooler weather, no Biggie.

This spring I'm thinking, I never had a problem running A/C on the 20 amp circuit. So I ordered New Capacitors, and an ACM starter. Tested again, no A/C cooling.

Well the Compressor is not running, so I open the T-stat box, the check the 12 volt out to the compressor relay, it's not there. I jump the compressor relay, and the compressor fires up and is running. I think I'm almost there solving the problem, Double check the wire, no 12 volts to the compressor relay, resistance checked the wire, its good.

Well, suspect its the T-stat box, everything is working but the Compressor relay 12 out. Parts ordered, stay tuned
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Old 05-20-2019, 09:56 PM   #2
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Good luck.

Are you jumping the relay at the thermostat or at the a/c itself?
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Old 05-20-2019, 10:15 PM   #3
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At first try it was at the T-stat box, this was when I found bad connections. Todays troubleshooting, started at the relay contacts, to prove the A/C would start and run on a 20 amp circuit. Then added 12 volts to the relay coil, at the relay board. Once this was proven intact and functional, I went to the T-stat box, and verified the missing 12 volts to the compressor relay.
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Old 05-23-2019, 08:50 PM   #4
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I guess you could say this is a five minute fix. It was like x mass day, opening today's mail delivery. Fingers were twisting wires at a feverish pace, the camper was 89 degrees inside after the days dose of sun. I flipped on the switch, and heard that magical sound of an air conditioning compressor firing up. I had nice coolair flowing, in 30 minute it went from 92 to 73 degrees. I'm a Happy camper.
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Old 05-23-2019, 09:06 PM   #5
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Way cool!
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