Whirlpool Refrigerator Error Code E2: Thermistor... | appliancefaults.com

Technical Background:

The E2 error code on a Whirlpool refrigerator indicates a problem with the evaporator thermistor circuit. The main control unit (MCU) monitors the voltage signal from the thermistor, which varies with temperature. If the voltage is outside the acceptable range, the MCU triggers the E2 error code. The thermistor is a negative temperature coefficient (NTC) resistor, meaning its resistance decreases as temperature increases.

Symptoms:

The homeowner observes an E2 error code displayed on the refrigerator's control panel. The refrigerator may not be cooling properly, or the freezer may be warmer than usual. Ice maker function may also be affected.

Possible Causes:

Faulty evaporator thermistor
Wiring harness issue between the thermistor and the main control board
Loose connection at the thermistor or main control board
Defective main control board (MCU)
Thermistor not properly seated or positioned
Excessive frost build-up affecting thermistor readings

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the evaporator thermistor (usually behind the evaporator cover inside the freezer compartment).
3

Using a 1/4-inch nut driver, remove the evaporator cover screws and carefully remove the cover.
4

Visually inspect the thermistor and its wiring for any damage or loose connections.
5

Using a multimeter, measure the resistance of the thermistor. Refer to the Whirlpool service manual for the correct resistance value at the measured temperature. A typical reading at 32°F should be around 10k ohms.
6

If the resistance is significantly different or open, replace the thermistor.
7

Reassemble the evaporator cover and plug the refrigerator back into the outlet.

Safety Warning:

Always disconnect the refrigerator from the power source before performing any repairs. Wear safety glasses to protect your eyes from debris. Be careful when working with electrical components to avoid shock hazards. Lock Out/Tag Out (LOTO) procedures should be followed to ensure the unit is de-energized during repair.

Prevention:

Regularly check the refrigerator for proper cooling and freezer temperatures. Clean the condenser coils at least every six months to ensure efficient operation. Avoid overloading the refrigerator, which can restrict airflow and affect thermistor readings.

Expert Tip:

After replacing the thermistor, initiate a forced defrost cycle to ensure the refrigerator is functioning correctly. This can often be done by pressing a specific sequence of buttons on the control panel (refer to the service manual for the specific key combination for your model).

Frequently Asked Questions

•How do I access the service mode on my Whirlpool refrigerator?

The service mode access varies by model. Typically, it involves pressing a combination of buttons on the control panel within a specific timeframe. Consult your refrigerator's service manual or search online for the specific key combination for your model.

•What is the correct resistance reading for the evaporator thermistor at room temperature (70°F)?

The resistance value varies depending on the specific thermistor model. However, a typical NTC thermistor used in Whirlpool refrigerators will have a resistance of approximately 3k to 5k ohms at 70°F. Always refer to the Whirlpool service manual for the exact specifications for your refrigerator's thermistor.

•If the thermistor tests good, what else could be causing the E2 error?

If the thermistor tests within the specified resistance range, the problem could lie in the wiring harness connecting the thermistor to the main control board. Check for any breaks, shorts, or corrosion in the wiring. Also, inspect the connections at the main control board for any looseness or damage. If the wiring and connections are good, the main control board (MCU) itself may be faulty and require replacement.

Whirlpool Refrigerator Error Code E2: Thermistor Replacement Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the service mode on my Whirlpool refrigerator?

•What is the correct resistance reading for the evaporator thermistor at room temperature (70°F)?

•If the thermistor tests good, what else could be causing the E2 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: