Question about Whirlpool ET8WTKXK Top Freezer Refrigerator
Yes you can. First with a small bladed screw driver, turn the shaft of the timer clockwise while the machine is running. Wait 35 minutes, if the timer turns the machine back on, it's O.K. If not, it's defective and needs replaced. If it checks O.K. then it has to be either the limit thermostat or the heater. 90% of the time it's the limit, however, check the heater first. Remove the wires, and using an ohm meter test the heater for continuety. It should read less than 35 ohms. If it checks infinity, it burned out and must be replaced. If O.K. then just change the limit thermostat. It's the only item left that could be causing the problem.
P.S. It is standard proceedure to replace the limit thermostat if the heater checks bad. Replace both at the same time. If the limit checks bad, replace it only.
Posted on Jul 13, 2010
Testimonial: "Thanks for the help, tested my timer, and was able to determine the issue was the clip on defrost thermostat; a $28 part. Saved me a service call!!"
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Posted on Jan 02, 2017
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The automatic defrost system has 3 parts. 1: Timer. 2: heater. 3: thermal switch
The timer will start the automatic defrost cycle every so many hours. If the timer fails, the defrost cycle will never start. The electrical schematics should be under or on the back of the refrigerator. You can use this to figure out how to test the timer.
The heater is what does the actual defrosting. If it is broken, it will not heat.
The thermal switch turns the heater off when enough ice has been melted. If this switch fails, it will prevent the heater from heating.
The heater and the thermal switch will be wired in series and their connections will be securely covered so you cannot test them independently. You can electrically test then together but you cannot decide which one is broken unless you expose or cut a wire. I have never seen a heater fail.
I see timers and thermal switches fail. Heaters don't fail very often.
The heater and thermal switch are in the freezer area and are very close to the evaporator. You will have to take apart enough of the freezer compartment to get to these parts. You will also need to melt enough ice to get to these parts.
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