Question about Coleman Heating & Cooling

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My Coleman works perfect as designed, but for only about 5 to 10 minutes and shuts off as if it had reached the t-stat setting but has not. NO noises sounds perfect, no dirt very clean, cools excellent while running, good ac voltage and good dc voltage, t-stat fuse is good. It is a model 7333B876 any ideas?

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  • doncrawford Jun 28, 2009

    I have checked all 3 capacitors. Every thing starts and runs great for 5 to 10 minutes, nothing overheats, air cools good, compressor overload is not opening. I have checked all wires going into the compressor and non are shorted to the case. All cap check good and look good. ?????????

  • doncrawford Jun 28, 2009

    This is in a motor home, ALL 120 VAC breakers have never and are not tripped, ALL 12 VDC fuses and circuits are good. NO overload or sensors are tripped on the unit mounted on the ceiling. I have measured all current and it is correct. There are 2 identical units on this coach and the oter has no problems. REMEMBER the unit works perfect when it decides to work but only will work for 5 to 10 minutes and it does not trip any breakers or blow any fuses. It will just sit idle and come on on it's own a little later with out touching anything.

  • doncrawford Jun 28, 2009

    I removed the cover from the top of the compressor and lifted the thermal sensor up from the top of the compressor so it would not sense the heat from the compressor and it still cut off, it was about an inch off the compressor. I did not check the external temp on the compressor but it was very hot to the touch. The compressor starts easy runs smooth and works great as the air gets very cold while working. I check the continuity on the sensor and it was in the closed position at all times. Any other ideas.

    Don

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4 Answers

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  • Master
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This unit is prone to faulty ?Motor running Capacitor? for shorted and leaky capacitor. You said you check already the 3 capacitors its fine not shorted. But you do not check for it maybe leaky capacitors. Leaky capacitors its check good and look good can run the unit but it will stop or shutdown automatically and then run again it is the symptom. Also check the refrigerant Freon gas or CF4 maybe out or slowly leak out. This unit also it will goes on and off if there is a shortage gas involved. Also clean the thermostat control so it works fine. Good luck hope it may helps: Regards: VOTIT

Posted on Jun 28, 2009

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  • Coleman Master
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The compressor has a safety circuit called a thermal shut down, it turns off the compressor if it exceeds a present temp limit, u either have a defective compressor that is running hot or the thermal sensor is defective.

Posted on Jun 28, 2009

  • yadayada
    yadayada Jun 28, 2009

    just because the compressor works doen't mean it is ok, this still sounds like a compressor overheat issue.

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In my opinion this problem is caused by one of the circuit breakers being tripped in this unit i.e the unit is operating correctly but a faulty sensor is tripping the circuit after a while of operation. I will outline below the possible causes;

Posted on Jun 28, 2009

  • Radio Code Pro
    Radio Code Pro Jun 28, 2009

    1) Blower motor overload or overheat switch: a built-in overload protector used in some electric motors, especially the electric motor used to power the air handler's blower fan, may be tripping.



    2) Air handler circuit breaker: in the electric panel there will be a switch controlling power to the air handler/blower circuit, perhaps two different circuits, one for the air handler unit, and a second for the compressor/condenser unit



    3) Blower compartment door switch: an air handler blower compartment access door switch is present on newer units, and can be seen as a button or switch which is depressed when the blower compartment door or cover is properly in place. This switch shuts off the blower fan as a safety control if the door is opened (May not apply to your model but if it does should be checked out)



    4) Air handler service switch: at the air handler/blower unit, typically on the unit or on a building surface close to it.



    5) Condensate overflow tray sensor switch: at the air handler, especially in an attic or closet or upper floor air handler, installers may provide an electrical switch (rather than a separate drain pipe) to detect spillage of air conditioner condensate out of its normal air conditioning condensate drain pipe. The condensate overflow switch is a sensor which turns off the air conditioning system as soon as it detects water in the condensate drip tray. (Again may or may not be installed on your unit but if this switch is defective it will cause the unit to trip)





    An air conditioner fan or blower motor overload reset button may be present on the blower motor in the air handler/blower compartment. Look for a red or yellow button which is normally flat with the motor surface but which will pop up to show that the motor has been shut off by its internal overload protection circuit.



    Unfortunately I cannot find any schematics that relate to your particular model. However you can see that these systems are complicated and have several overload switches built in.



    In my opinion it is one of these overloads that is tripping in your unit and causing the problem. Hope this is of some help to you in tracing the issue. If so please rate accordingly.

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  • Master
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Hi there,

You need to check the capicitor, you will see a set of wires comeing out and there will be 2 5/16hex screws holding acess cover in.

Good Luck!!
Thanks

Posted on Jun 28, 2009

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