Question about Coleman Mach 15 Air Conditioner

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I have 2 15mbtu units, new, they work great on AC, but it just got cold on Friday night and the heat side doesn't work, the fan comes on when switched to

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  • crawpatt04 Nov 13, 2010

    Thanks for your response, it seems perfectly reasonable and I will try it next week when I return to
    my daughter's. My first thought is, what's the likelyhood that both units would have the same, odd,

    Jim Crawford.



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Remove the cover, find the connection for the heat strip. Keep in mind that some models may have a fuse in the heat circuit. Look for one before you go any further. Of course, if it is blown, you know what to do, right? Fuse good?

With a tool volt/ohm meter set on ohm, test the strip for contuitinity. There will be some resistance showing on the meter if it is good. If it reads open (no reading) it is burned out and needs replaced. Some reading indicates it is a completed circuit.

If this first tests is good, then test for voltage, turn on the heat strip. Set the temperature high. Place one probe on one end of the strip the other probe to the metal shell of your unit. Test the other end of the strip. No reading at either end points to the thermostat or the switch that selects heat. Go to the switch and see if it is passing voltage to the thermostat. Test all leads into the switch.

You said your fan is running so there is voltage going into the switch fan contact. If there is power going to the heat strip contact, (which should run through the thermostat) that points to the thermostat. Does your rooftop cool? If yes, that says that part of the thermostat (cool) is working. I'm leaning toward the heat strip being faulty. You said you have used it many times... these heat strips are pretty robust but not indestructable.

If you are handy, and I could say you, that you are because you are at this fixing place, you can probably install a new strip. I presume you are in a area where it is not bitter cold or your main coach heater is working now. If you are a 50 amp hookup, you can probably add a small electric heater and not run into trouble with the power. Your AC/heat is running on a 15 amp circuit - probably by itself. The limit on your heater should be no more than what the heat strip would use - 115 Volts X 15 amps or about 1700 watts, dont go any higher with a replacement heater. If you have a 50 amp service... you can probably add two heaters and be ok but with a 30 amp... don't do it.

Additional details could find it in THIS LINK.

I hope helps.

Posted on Nov 09, 2010


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