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12-06-2012, 12:13 PM
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#1
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Senior Member
Join Date: Apr 2001
Location: Hood River, OR
Posts: 121
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A/C won't stop!
My rig is 12 years old. The rear Duo Therm compressor will not turn off. One night it just kept groaning after freezing up. I can shut off the fan, and the fan responds in "auto", but the compressor keeps going. The only way to shut it down is with the breaker.
I suspect a starting relay that is welded shut, but don't know where to look for it. Inside or outside? Replaceable by a submarine engineer?
TIA for any advice.
Subsailor
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12-06-2012, 01:08 PM
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#2
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Registered User
Vintage RV Owners Club Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,951
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Actually, I suspect low freon and now a bad compressor..
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12-06-2012, 01:20 PM
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#3
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Senior Member
Forest River Owners Club Ford Super Duty Owner
Join Date: Aug 2009
Location: Vaughn, WA
Posts: 1,460
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Mine did that to me once last year. I went up on the roof, removed the cover and banged on the compressor with my fist. Been fine since then. Don't know if it will work for you but it was a simple solution and it is always satisfying to beat on something that won't hit back.
__________________
Nick
1995 Coachmen Santara 360MB 36' w/slide.
Ford F53/460 chassis, 2020 Chev Equinox "toad"
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12-06-2012, 02:04 PM
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#4
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Senior Member
Rexhall Owners Group
Join Date: Aug 2012
Location: Lakeview, Oregon
Posts: 595
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I agree with a stuck relay. If you can turn the switch to off the compressor should shut down as well as the fan. If you need to trip a circuit breaker then it points to a relay.
Martin
__________________
Martin Picke'
1998 Rexhall Anthem 34' DP, Cummins ISB, Allison 6 speed, Spartan Chassis, 300 watts solar.
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12-06-2012, 07:11 PM
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#5
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Member
Monaco Owners Club
Join Date: Sep 2012
Location: Minnesota
Posts: 61
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Same problem with the condensor fan on ours, it never shuts off.
Checked it out and it is the relay. Did some searching and I guess there are a few units that have that problem. Our unit is a RVAC two-stage basement unit.
__________________
1994 40' Holiday Rambler Navigator (Jenny II)
Chevy Tahoe following very closely
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12-06-2012, 07:25 PM
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#6
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Registered User
Join Date: Nov 2012
Posts: 195
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Quote:
Originally Posted by Midniteoyl
Actually, I suspect low freon and now a bad compressor..
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the freezing part can be due to low freon but not the fact he cant shut it off has no bearing on freon content. However if he shuts off the fan and the compressor continues to run it will freeze up
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12-06-2012, 07:30 PM
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#7
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Member
Join Date: Dec 2011
Posts: 50
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Most rv compressors are hooked to the thermostat this could just be stuck an needs to be replaced. Does it have wall controls or are they self contane in the unit it self
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12-06-2012, 08:05 PM
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#8
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Registered User
Join Date: Nov 2012
Posts: 195
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Quote:
Originally Posted by Andycamper
Most rv compressors are hooked to the thermostat this could just be stuck an needs to be replaced. Does it have wall controls or are they self contane in the unit it self
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i do beleive in all logical context all RV AC systems are hooked to thermostats
and the OP says the fan shuts off via the stat so as i view things the stat is working
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12-06-2012, 09:00 PM
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#9
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Registered User
Vintage RV Owners Club Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,951
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Quote:
Originally Posted by rvrepairnut
the freezing part can be due to low freon but not the fact he cant shut it off has no bearing on freon content. However if he shuts off the fan and the compressor continues to run it will freeze up
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Didnt see where it ran after he turned it off in the original post..
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12-06-2012, 09:06 PM
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#10
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Registered User
Join Date: Nov 2012
Posts: 195
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Quote:
Originally Posted by Midniteoyl
Didnt see where it ran after he turned it off in the original post..
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I can shut off the fan, and the fan responds in "auto", but the compressor keeps going. The only way to shut it down is with the breaker.
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12-06-2012, 09:22 PM
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#11
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Senior Member
Join Date: Jul 2012
Location: Biloxi, Ms
Posts: 199
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Had this very thing happen at the sticks and bricks. It was a stuck relay. Contacts had arced and stuck. Keeps the evaporator as a solid block of ice. Your relay is probably located on top on the coach under the AC cover.
__________________
Wayne and Susan
2012 Georgetown 351 DS | 2012 Ford Focus-Brake Buddy
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12-06-2012, 09:28 PM
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#12
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Senior Member
Vintage RV Owners Club
Join Date: May 2011
Location: Port Hadlock, Washington
Posts: 2,855
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Quote:
Originally Posted by Nick-B
Mine did that to me once last year. I went up on the roof, removed the cover and banged on the compressor with my fist. Been fine since then. Don't know if it will work for you but it was a simple solution and it is always satisfying to beat on something that won't hit back.
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I think this is the best place to start....there could well be something stuck in there and whaling on it might jar it loose, as it evidently did for Nick.
Side (though not insignificant) benefit to this approach:
It'll teach that thing who's boss- and sometimes that's all it takes to bring inanimate objects in to line. 
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