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Coleman air condition compressor will not come on

Have a 1993 wilderness travel trailer with a coleman a/c unit. The compressor will not kick on. Checked out thermostat. Did not have 12volts on legs to thermostat with just the fan running, but could make it kick on by touching both legs at the same time and getting twelve volts at the control board in the ceiling. If the overload switch on the compressor is bad, would the compressor still work by doing this? Or would this just be a bad thermostat.

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  • dchuffman Sep 07, 2009

    I did not jumper the leads at the t-stat. I jumpered the leads on the circuit board. The instructions for

    testing were with the FAN ONLY position you should read 12vdc between terminals GH and B at the Low Voltage Terminal strip. I Only had 7 volts so I jumpered the terminals GH and B and got 12 volts

    and the compressor kicked on. I am just trying to figure out if a new t-stat will fix the problem or if the overload switch was blown.

  • dchuffman Sep 07, 2009

    i went back and tried to jumper at the t-stat, but the compressor would not come on. but if i go back

    to the control panel and jumper pass the relay the compressor comes on. does this verify it is the control board and/or the t-stat.

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If the thermal limiter was blown the compressor would not run, if you jumper the compressor leads at the T-stat does the compressor run? if so the thermostat is the problem, but it is more likely the problem lies in the control board at the compressor itself, but try the T-stat 1st and keep your fingers crossed that is the problem.

Posted on Sep 07, 2009

  • yadayada
    yadayada Sep 07, 2009

    if u can't jumper the wires at the thermostat and make the compressor run then the board is defective.

  • yadayada
    yadayada Sep 07, 2009

    the control board is defective.

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