Question about Carrier 52PQ307 Wall/Window Air Conditioner

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The over load device burned up,," fryed" I"m

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  • Roger Jelinek Apr 05, 2011

    You mention the compressor over heating. Compressors are protected internally by a thermal overload embedded in the motor winding. Some units do have a second overload for low voltage, but that's not normal for smaller compressors. If the capacitor is a metal can and has swollen up, replacing it may solve the problem. All of this is on the line voltage side of the system though and should not have burned up a low voltage over load. Before trying to start the compressor, disconnect its wiring and test each of its connections to ground. A burned up over load on the low voltage side is a different problem and tests. Let me know how you are doing. I will explain further tests if you need me to. Please rate this response. Roger

  • bruced94 Apr 07, 2011

    Hi Roger
    On the top of the compressor their are 3 wires under a cap. One to run one to start ,one to common.The wire to common has a device the schematic calls a overload it sits under the cap that covers the wires on to of the compressor. The cap holds this device to the top of the compressor.. this device is fried.
    The symbol on the schematic looks like 2 fish hooks stuck together at the hook ends. It says Klixon on top of the device.. It looks like it was to open the circuit when the compressor got to hot. This is a Carrier model #52CQ501204.... AC-- Heat Pump. This device is about the size of a twist off cap from a soda bottle with wire terminal plug slots on top.. Coffee pots use something like this to regulate the pot warming plate temp. It reminds me of them.

  • bruced94 Apr 07, 2011


    Klixon overload # MRA4726 was my trouble .... Where can I buy this part? I cant find a place to buy AC- heat pump parts I live in New jersey.. WEST MILFORD NEW JERSEY 07480
    you have given enough info to figure this out,, if you could lead me to parts you would make me a happy camper .. Im retired and trying to save a buck. Thanks for your help.



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: I have purchased a new capacitor to replace the

those little clips are hard to find (sort of) but I would think Home Depot, Lowes, or any hardware store would stock them.

if not - you can always go to an 'air conditioning supply house' (wholeseller) - or an 'electrical supply house.' (fyi most wholesellers will sell to anyone, but not at a wholesale price necessarily).

good luck!

Posted on Jun 22, 2010

  • 143 Answers

SOURCE: Wiring compressor

The two terminal cap is only for the new fan motor. Connect the compressor wire back where you found it, on the 3 terminal cap. It's the terminal marked, "herm". The "common" terminal on the 3 terminal cap must still be connected to one side of the 220 power at the contactor. One side of the 220 goes to the common on the compressor. The other side of the 220 goes to the run winding on the compressor AND the common terminal on the 3 terminal capacitor.

Posted on Jul 22, 2008

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SOURCE: condensor fan not running after replacement

check fan rotation

Posted on May 31, 2009

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SOURCE: Have carrier heat pump that buzzes

What exactly does it do? If it buzz and don't turn a starting capacitor will not help, this is an indiction of a shorted motor.

Posted on Jul 02, 2009

  • 3361 Answers

SOURCE: Weatherking 3 ton Run Capacitor

Could be; age,lightning,power surge,defective wire,loose wire,tight compressor. Capacitors fail sooner or later. They are like batteries they do not last for ever.

Posted on Aug 04, 2009

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