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Old 10-22-2013, 12:56 PM   #1
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A/C wont go turn off

Hello all. Any help or ideas will be so appreciated. I have a stationary 2002 Keystone Springdale 5th wheel. AC wont go off. I can turn fan off at thermostat but cooling part keeps running. The only way to turn it off is at breaker box. THEN I have no power for outlets, refrig etc. Went back a few weeks later, turned power on at breaker and now refring will not come back on at all. AC still running when I trun breaker on. I am at a loss of what to do. Thank you.

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Old 10-22-2013, 01:12 PM   #2
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Not sure how to advise you on the refring.
You should have a 120V panel with breakers; there should be a breaker for the AC. Shut it OFF. Sounds like you have some sort of relay that has welded its contacts together to keep the compressor running; that may be internal to the AC or external, I'm not familiar w/your rig. After that breaker is OFF there will be no 120V to the AC, but the rest of the breakers should still be live. You should be able to diagnose the refring after that w/out interference from the AC problem.

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Old 10-23-2013, 06:46 AM   #3
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The 12v powered thermostat powers a relay (called on contactor in the A/C industry) which switches the compressor/fan motor off and on. More than likely it has gone bad. Look at the wiring diagram for your a/c and it should show you were it is at.
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Old 10-23-2013, 06:53 AM   #4
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Sounds like the contactor (relay) has welded itself closed.

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