Question about Whirlpool 18.2 cu. ft. Top Freezer Refrigerator ET18PKXG

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Whirpool ET18NM refigerator. Freezer doesn't stop. can see ice starting to form in refrigerator compartment. turned off as it woyld not stop. Ideas?

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  • Larry Knehr Mar 12, 2011

    this would keep the freezer fan from turning off?

  • Larry Knehr Mar 12, 2011

    This would keep the fan from turning off?

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DEFROST PROBLEM
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.

If this ice is not melted it will continue to build up until the air can't flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.

If the defrost thermostat is bad, it can prevent the heater from coming on OR it won't turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.

The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it's bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it's in the defrost mode.

You have a defrost timer you can test it. It's part 4 on this DIAGRAM AND PARTS list.. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Posted on Mar 12, 2011

  • Charles T Nevin
    Charles T Nevin Mar 12, 2011

    Yes. When there is too much frost on the coils the cold can't be blown by the fan because the ice blocks it. If it doesn't reach it's selected temp as quick it will have to run longer to get the that temp.

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