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Now to tell if defrost timer is bad

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I have been reading the sticky's and other post. I know that I having defrost trouble. I checked the heater

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  #1 (permalink)  
Old 10-23-2011, 03:45 PM
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Default Now to tell if defrost timer is bad
Model Number: IT18SKXRD00   Brand: Whirlpool   Age: 1 - 5 years   

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I have been reading the sticky's and other post. I know that I having defrost trouble. I checked the heater and got about 30 ohms on it. That tells me that the heat is not shorted out or open. One of the sticky's said to manual turn the heater on with a small screwdriver on the defrost timer. I can not do this because there is no hole in the unit. Can you short out a wire or remove one to start the heater? I'm looking for a way to check the timer before buying one.
Thank for all info.


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  #2 (permalink)  
Old 10-23-2011, 05:18 PM
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Here are your parts
Replacement parts for WHIRLPOOL IT18SKXRD00 REFRIGERATOR | AppliancePartsPros.com

You do not have a defrost timer, you have an adaptive defrost board (Item 4 in Section 3).

See the attachment for the tech sheet. It has the procedure for turning the defrost cycle on.
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File Type: pdf IT18SK.pdf (225.8 KB, 6 views)
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Old 10-23-2011, 07:03 PM
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If neither options works,would the adaptive defrost board be defective? The motor is running continuously.With the price of a new adaptive defrost board I would like to be sure that is it.
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Old 10-24-2011, 05:31 AM
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If neither options works,would the adaptive defrost board be defective?
Yes but if you are looking for a 100% guarantee on this I cannot give it to you.

If it does go into a defrost cycle, it does not totally eliminated the board as being bad.
You checked the defrost heater and that looks OK.
You also have to check the defrost thermostat, it should be 0 ohms when frozen. Note that it opens just above the freeze point. Also if it is deformed/bulged replace it even it it measures OK.

If both the above are OK then replace the defrost board as it is not scheduling a defrost cycle.
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