Question about Coleman Mach 15 Air Conditioner

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Not working Hello I have chcnged out the tremastadt and the control board and i als checke my 12 volt fuse and my 115 braker and still my unit does not work what else can i do or try. My e-mail add is if you need to get in touch with me i need help quick i am living out of my camper in Texas and it is getting hot. Kind regards Hans.R.Warren

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  • Anonymous May 11, 2008

    Cant say I have the same problem but a RV dealer said make sure you aren't using a standard extension cord. Connect the RV cord directly to the power source. Maybe this will help.



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The fan is not working

Posted on Sep 21, 2008

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If absolutely nothing is working, and you are getting 115v, changed the fuse, like you said. Then the problem may be the transformer.

Posted on Mar 05, 2008


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have the voltage regulator system checked
in the regulator the voltage controls the amperage allowed and it that unit is not working properly then there will be no current out put
that regulator could be part of the control board for the main ac out put and may have developed a fault in the section for 12 volts on the board
there is a limit on the charge rate for the battery and if it is exceed it may have damaged that circuit or possible blown a fuse in the amperage circuit

May 07, 2016 | Buffalo Tools Electrical Supplies

1 Answer

I forgot to switch the current from 230 to 115 but

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You may have a defective control board or blower motor. You will need to find on the main control board the location where the blower motor (marked heat) is connected. Using a volt meter, after resetting the limits and restarting unit, you will need to check and see if the board is supplying 1115 volts to blower motor (between the blower heat terminal and one of the neutral terminals on board). Also have someone hold in the door safety switch, or put a piece of tape on the switch, The switch will pop out when the bottom furnace door is removed, this is the normal location of control board. As the furnace goes through its normal cycle and prior to locking out on safety (limit opening) you should get 115 volts from the board (terminal marked blower / heat). If the board does not put out 115 volts, then the board is defective. If the board puts out 115 volts and the blower does not operate, the blower motor is probably defective, there is one more check to do. Close the door and put your system in cooling, see if the motor starts, if it does, then the low speed (reactor) is defective and motor needs replacing. If the motor does not start in cooling mode, you may have a defective capacitor. Check all of the above first and see what happens. Good luck, and be careful.

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1 Answer

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