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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1 Answer

Cannot get ANY of the fans to work.

one half of the breaker you moved is not making contact in the panel or moving the breaker caused the fan relay to be on the same 115 volt leg as the power leg. If the breaker is connected to two points in the panel and you have 115 volts on each side of the breaker (230 volts) You can move the breaker one notch higher or lower or switch wires on the breaker to correct the circuit.

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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.

Dec 07, 2011 | Heating & Cooling

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Hello, the blower motor will stop running for one of three reasons 1) bad control board 2) bad capacitor 3) the motor itself is bad Usually once the motor cools off the overload will reset .

Jul 20, 2011 | Heating & Cooling

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Condenser unit will not run. has 240 volt at contactor, but no 24 volt control power to coil. Control Transformer has 24 volt output. Blower will run but condenser unit does not operate.

Hello, check the tstat wiring going to the unit for any breaks in or if it has come loose between the indoor unit and outdoor unit. Also, chevk if you are getting voltage from tje control board between the y and c terminal, if not the control board is bad. Last thing to check is remove tstat and jump the y and r wires there if this starts the unit then you have a bad tstat.

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Try the fan switch inthe ON setting rather than the AUTO setting, if it runs, power, both low(24) and high(115 or 230) are present. if not, check breakers and fused outlet if a split system furnace, read for 24 volts at red and common on low voltage terminal board where thermostat wires go on the furnace, if no 24 volts there and poers entering furnace, transformers bad.

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1 Answer

No power going to my heating/cooling unit. Tried to replace the t-stat and it is not getting any power. Checked the breaker and wiring at unit and t-stat to make sure they are wired correctly. Any help?

Sounds like a low voltage transformer is bad.

Possible bad relay.

One side of the low volt trans will have 115 volts.The other side should have 24 volts.Going to the heater.The t stat completes this circut when calling for heat.

Some units have a reset on them or a small control fuse.Near the low volt trans.

Jan 05, 2010 | Heating & Cooling

1 Answer

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Could be a lots of things why it won't start First check the brakers for the inside snd outside units ; 2 If you have a digital thermostat ,put new batteries ; 3 Also if the drain line is clogh and there's a flood switch installed in the drain line by the air handler , it will shut of the unit (sometimes flood switch is on the drain pan inside the air handler).4There's a small fuse in the control board for the air handler. 5Also if nothing works could be a burned transformer.

Aug 14, 2009 | Heating & Cooling

1 Answer

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1 Answer

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Hope this helps,


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1 Answer

I got an indoor unit working on fan mode only...the compressor on the outdoor unit is not kicking in...even though there is power to it..iv checked the fuses on the pc board outdoors...any suggestions...

There are two different power voltages to these outdoor units. 24 volts in the control circuit and 230-240 volts for the compressor to operate. Checking the fuses as good does not insure that power is to the unit. You need to check the power with a volt meter.

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