Question about Coleman Mach III Air Conditioner

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My compressor on my coleman tsr will not kick on I can turn the thermostat all the way down and then ease it up the compressor never will come on it worked fine the day before

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Check that the thermostat is OK. You can do this with an Ohmmeter or a Volt Meter. If it is cool only, there are two terminals on the rear. Cut power to the AC and remove these wires and with an ohmmeter, check the two terminals for continuity. If there is none, then turn the dial all the way to the coldest setting and see if it changes. If not, you have a bad thermostat. If you have continuity and the compressor still does not come on, check the Start Capacitor in the upstairs unit.

Posted on Jun 30, 2009

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Make sure thermostat switch is turning properly,maybe stripped? Good luck!!!

Posted on Jun 21, 2009

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1 Answer

Compressor won't kick on


You should be able to hear the compressor kick in. If you don't the most likely culprit is the capacitors. I generally keep spare capacitors on hand at all times, because they are mostly likely to fail on a holiday or a weekend when it is 102 in the shade. If replacing the capacitors doesn't work, you want to look at the thermostat. You will have to look up manuals and testing for your thermostat. And if those things doen't solve your problem, sadly and lastly, you will want to do troubleshooting on the control module in the ceiling. The control module generally resides in the ceiling and you access it through the vent in the ceiling.

Here is where you can find manuals for your a/c unit. Click on the links under the tab for technical information. Airxcel RV Products Good luck!

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