Question about Goodman CKL49AR49 Air Conditioner

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Model # ckl49-il serial # 0506126514. This unit stopped working yesterday, noticed the fan on the outside compressor wan't turning, how do i test the capacitor and fan to see which one to replace?

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By far the most common problem with air conditions is the relay (known as a "contactor") by the air conditioner industry. This allows a low voltage (24 volts) electromagnet to turn on the 220 volt motor for fan and compressor. A replacement will generally cost about 50 to 75 dollars on Amazon.com.


Look for the wires entering the unit, The pair of wires entering the unit will go into a small (4" x 2" x 2") unit (the contactor). Another pair small diameter wires will go into the contactor (those are from the thermostat (or control panel of your furnace blower) and control the electromagnet switch.

The pair of output wires exit the unit and go to the compressor motor and fan.

You can check the output power by
1) Turning off the circuit breaker to the A/C
2) Unplugging the switch (must be a second switch within 3 feet of the A/C) near the house
3) opening up the outside panel on the A/C
4) Set voltage meter probes on the two output wires on the Contactor (make sure voltage meter is set to 220 volt AC range or higher)
5) turn on the outdoor switch
6) turn on the circuit breaker (if no body is near the unit and you can see the voltage meter without touching it)
7 check voltage meter to see that is says 220 volts AC

If not, then the contactor is bad and needs to be replaced.

A professional can usually do it for $200 including service call. I highly recommend calling a professional if you feel uncomfortable in any way about working with 220 volt systems. This voltage will kill you if you make a mistake!

-Mark

Posted on May 28, 2011

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That is where I'd start.

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Outdoor fan will stop running and compressor overheats and shuts off. it wont come back on til u reset it at the thermostat. the outdoor unit has a new compressor and fan motor.


I realize the outdoor unit has a new compressor and fan motor - therefore - both those components should be ok - however - the fan motor 'should not' be going off - and the fact that it is going off is what is causing your compressor to overheat and shut off.
The reason the fan motor is going off is - it is bad (breaking down electrically) and is going off on the internal overload. If this is the case (a) the motor needs to be replaced or (b) it's possible that the fan capacitor needs replacing; but fan capacitors generally do not cause much problem, and when they do go bad they usually develop an obvious (to the eyes) bulge. If the capacitor has a bulge in it - I would surely change it out -and probably would (as a shot in the dark) anyway - since they are relatively cheap ($10-$15).
In your complaint you say that "the outdoor fan will stop running and compressor overheats and shuts off." If it happens 'exactly' that way then I'm betting your problem will be that the fan motor is defective as mentioned above, with an outside chance of the capacitor being defective, in which case if it isn't the capacitor - you will need a new fan motor. Note: outside fan motors are notorious for being fickle and it would not surprise me in the least to find a fairly new outside motor that is defective. I would check and see if you had any warranty on it.
All that being said - it is also possible that your outside unit has a 'high pressure cut-out switch,' although most units don't have them anymore, these days. However, if you have such a switch - it is possible (very likely) that it is shutting off the AC. Note: a high pressure cut-out switch will 'shut the entire outside unit off,' not just the fan motor. If that is what is happening then there's a good chance you have such a switch.
If it is happening that way, (the entire outside unit stops) then I would try 'washing the outside coil' really, really good and see if it will run ok afterwards.
Note: outside coils are sometimes difficult to get clean - sometimes requiring you to disassemble to some degree in order to make sure you get them clean.
Always, Always turn all power (including inside thermostat) OFF when washing the outside coil.

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1 Answer

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