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Old 09-04-2019, 04:44 PM   #1
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Figured out a Coleman Mach repair after compressor wouldn't shut down

Hello all,

Yesterday my Coleman Mach 8 in our bedroom of our 2019 319MLOK had an issue. I figured out the issue and just wanted to post a solution in case someone else has the same problem. The compressor wouldn't shut off even after you switched the thermostat to off. I flipped the breaker waited about 20 mins and flipped back on hoping for a reset. No such luck.

Well I could have dealt with an attempted warranty repair and waited for God knows how long here in Nevada or try to fix the problem myself. I searched around and found an old post from 2012 where a guy had the same issue He problem solved the thermostat by disconnecting the compressor wire from it. I did the same and the compressor still ran, so that ruled the thermostat out. He ended up replacing the control board. I searched part list online and I located the control box part number. It cost around 65 dollars unless you need it fast. It's difficult to source locally unless you live near a major RV retailer but a local shop ordered one overnight for a premium.

The unit was easily replaced, easier than wiring a new light, and it works better than before. BTW on the new units the relays are wired into digital boards so a relay replacement is out. The relay cost almost as much as a completely new control module. Hope this helps someone down the line.
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Old 09-04-2019, 05:06 PM   #2
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Good info, thanks for posting.
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Old 09-04-2019, 06:28 PM   #3
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My son had the same exact problem on his brand new 5th wheel. You could hear the compressor running all the time all by itself. Had to kill the breaker to stop it.

Took it in for warranty service and they replaced the control board. After he got it back and tried it, the compressor would run like it was suppose to but there was absolutely no cooling. He verified the compressor was running by going up on the roof. Back to shop where they had to replace the entire unit.

I would guess that running the compressor without any air flow for an extended length of time destroyed it. Had to believe the dealer didn't notice it as you could easily hear it because it was in the bedroom.
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Old 09-04-2019, 06:36 PM   #4
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Yea that's very possible. Luckily it was only a couple of hours at the most for us and it works better than before now.
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ac compressor, coleman mach, thermostat, wont stop running

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