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How to check compressor

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The is a side by side that's 11 years old and has quit cooling. I pulled the back and there

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  #1 (permalink)  
Old 10-13-2009, 04:17 PM
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Default How to check compressor
Model Number: ksrb25qgbl01   Brand: Kitchen Aid   Age: More than 10 years   

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The is a side by side that's 11 years old and has quit cooling. I pulled the back and there is power. When I plug it in the fan motor starts, but I don't hear the compressor. Then in about 10 secs the thermal overload clicks open. I've measured the ohms from common across start winding = 3.7 ohms and across run = 2.7 ohms. I then put ohm meter on run capacitor. Started at 4.2 M ohms and rose. Next I put power on the run coil and on the start coil at the same time without relay and capacitor in circuit. Still couldn't hear the compressor and thermal clicked out again.

What should I check next, or do you thing this is a bad compressor?

gchardis@bellsouth.net


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  #2 (permalink)  
Old 10-15-2009, 04:41 AM
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Next I put power on the run coil and on the start coil at the same time without relay and capacitor in circuit. Still couldn't hear the compressor and thermal clicked out again.
You cannot test a capacitive start compressor without the capacitor in circuit.

Here is a link (see Item 3) which shows how to make up a test cord.
http://www.applianceaid.com/refrigerator.html

The winding resistance test and the capacitor test look OK.
Note that the capacitor test is not definitive as a meter does not put a load on the capacitor re: actual working voltage.

What should I check next, or do you thing this is a bad compressor?
Here is another link with good testing info.
Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com

I am assuming you have already checked the overload and relay by shaking them.
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