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Guide di riparazione e smontaggio per dispositivi per raffreddare il cibo, che include frigoriferi, freezer e frigo-congelatori.

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Freezer only getting to 15F. Ice buildup in back of freezer

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I have a Whirlpool WRV986FDEM French door style refrigerator that doesn’t get as cold as the set point of 0F. The evaporator fan runs continuously. I opened the back panel of the freezer and found ice buildup, which tells me it’s a defrost problem. I melted all the ice and started up the refrigerator again. The next day, the freezer was still not getting cold enough.

I checked the heater resistance with a multimeter (analog) and it was in the 70 Ohm range - normal. I ran through the diagnostics on the control panel to check the defrost heater/bimetallic/sensor, defrost thermistor, thermostat. The coils on the bottom of the fridge are clean.

Do I need to manually check the other components with a multimeter or is the control diagnostics good enough?

Can it be anything else besides a board failure?

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Here’s the most common causes that you can check out. There are three more causes but let’s see if one of these gets it first.

Cause 1

Defrost Control Board

The defrost control board determines how often to run the defrost cycle. If the board fails, the refrigerator will not go into the defrost cycle. Before replacing the defrost control board, first test the defrost heater and defrost thermostat. If the defrost heater and defrost thermostat are working properly, the defrost control board is likely defective.

Cause 2

Defrost Timer

The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. If the defrost timer is defective, it may not advance into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle. To determine if the defrost timer is defective, slowly advance the dial into the defrost cycle. The compressor should turn off and the heater should turn on. If the timer does not send power to the defrost components or advance out of the defrost cycle within 30 minutes, this indicates that the defrost timer is not advancing. If the defrost timer is not advancing, replace it.

Cause 3

Defrost Heater Assembly

The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, the defrost system will not work, and frost will continue to accumulate on the evaporator coils. To determine if the defrost heater is defective, use a multimeter to test it for continuity. If the defrost heater does not have continuity, replace it.

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Mrlaru sarà eternamente grato.
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