Question about Coleman Mach III Air Conditioner

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Coleman rv roof mount a/c compressor runs all the time. Thermostat will not turn compressor off. Cools fine.

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Replace the thermostat.

Posted on Jul 20, 2009

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Coleman fan runs compressor runs not cooling removed refrigerant evacuated and recharged still no cooling

Posted on Aug 15, 2009

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The only thing that is going to but the fan off is the thermostat. When the fan stops, immediately check the thermostat on the wall. See is there is power between the B terminal and the GH terminal. If none, then replace the thermostat. If there is, then replace the control board in the AC. That means that the fan relay on the printed circuit board is weak.

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I have a dometic 13500 BTU Roof mount a/c. It is set up with the duo-therm analog thermostat. The system cools fine. The problem is that the a/c gets down to the right temp, then it turns off like it should but turns right back on within a few seconds. Any help would be greatly appreciated.

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(1)Check compressor contactor or relay if it stock in the close position
(2)Check for welded contact points
(3)Check switch control for defect
(4) Check if compressor contactor still geting power when it is off


Let me know what works for you.

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