Question about Coleman Mach 15 Air Conditioner

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My Coleman A/C fan won't run, even in fan only mode, but the compressor kicks on. This happened after I manually turned the breaker off, then on.

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Your fan motor is either frozen ( no spinning ) or you have a bad capacitor.

Posted on Jul 08, 2010

  • JIMBO1 Aug 17, 2012

    Or has a flat spot, If you could spin it by hand and it works fine thats it.

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Coleman mach rv ac unit tripping breaker


If it trips the circuit breaker as soon as you turn the FAN on, suspect either a bad fan motor or a failed fan motor start capacitor. If you are able to turn the fan on but the circuit breaker trips as soon as the COMPRESSOR starts, it is possible that the compressor is seized.
If, on the other hand, the unit is tripping a GFCI (Ground Fault Circuit Interrupter) breaker or GFCI utility outlet, it is possible that neutral and hot are reversed at the outlet into which the trailer is plugged (happened to me this year at an RV park).

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Hello , this is Bobby and I have a Coleman Mach rooftop air conditioning unit Model # 8335B8964 when I turn on the unit ,it throws the circuit breaker . I have replaced the starting capacitor and the...


Here's a link to a service manual, with step by step tests to determine whats wrong. I'm thinking compressor shot, but this should confirm, and or help you determine for yourself. Be careful with those capacitors eh !! Read warning in service manual.

http://www.rvcomfort.com/pdf_documents/1976141_copy.pdf

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Take a look at your start capacitor. This the capacitor that kicks the compressor over when it tries to start. If the capacitor is bad, it cannot kick the compressor back over after the first cycle because the head pressure has not evened out yet. It is located in the upper unit on the side panel in a small box. Be careful, highly charged capacitors can zap you if you are not careful. Disconnect power and touch across the terminals with a meter or a screwdriver to discharge the capacitor.

Hope this helps,

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I have a coleman/evcon heat pump. When the thermostat kicks on the contacts kick in and hum but the compressor nor the fan run. Is this probably my capacitor has gone bad?


I would check the hig voltage power supply to the unit. Check the main breaker and make sure it is on. Check the disconnect and make sure there is power at that point to the condensing unit. The contactor will kick in from the low voltage in the control circuit.

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1 Answer

Ruud heat pump outside unit trips circuit breaker


Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.

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