Amana Refrigerator Error Code E2: Freezer Sensor Fault... | appliancefaults.com

Technical Background:

The MCU monitors the freezer temperature via a thermistor. The thermistor's resistance changes with temperature. The MCU interprets this resistance change to control the cooling cycle. An E2 error indicates the MCU is receiving an out-of-range or no signal from the freezer thermistor. This can be a wiring fault or a faulty thermistor. The MCU uses a 5V DC reference voltage to measure the resistance.

Symptoms:

The Amana refrigerator is displaying error code E2. The freezer may not be cooling properly, or the temperature may be fluctuating. The alarm may be sounding.

Possible Causes:

Defective freezer thermistor
Wiring harness issue between the thermistor and the MCU
Loose connection at the MCU or thermistor
Failed MCU (Main Control Unit)
Ice buildup around the thermistor affecting readings

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the freezer thermistor, usually near the evaporator coil. Access may require removing rear panel inside the freezer.
3

Visually inspect the thermistor and wiring for any signs of damage or corrosion.
4

Using a multimeter, check the resistance of the thermistor. Refer to the Amana service manual for the correct resistance value at a given temperature. For example, it might read 5k ohms at 77°F.
5

Check the wiring harness continuity from the thermistor to the MCU using your multimeter. Ensure no breaks in the wire.
6

Inspect the connection at the MCU. Reseat the connector to ensure a good connection.
7

If the thermistor resistance is incorrect or the wiring is faulty, replace the thermistor or repair the wiring.
8

If the wiring and thermistor check out ok, consider replacing the MCU. Remember that the MCU may require programming.

Safety Warning:

Disconnect power before working on any electrical components. High voltage is present when the refrigerator is plugged in. Follow Lock Out/Tag Out (LOTO) procedures.

Prevention:

Regularly defrost the freezer to prevent ice buildup around the thermistor. Ensure proper ventilation around the refrigerator to prevent overheating.

Expert Tip:

Sometimes, you can temporarily clear the E2 error by pressing and holding the up and down temperature adjustment buttons simultaneously for 5 seconds. This may help determine if the issue is intermittent or persistent. However, this does not repair the problem and it will likely return if the underlying issue is not addressed.

Frequently Asked Questions

•What is the typical resistance range for a freezer thermistor at room temperature?

Typically, a freezer thermistor will have a resistance of around 5k to 10k ohms at room temperature (77°F). Refer to the specific Amana service manual for the exact value.

•Where is the MCU located in an Amana refrigerator?

The MCU is typically located behind the control panel, either at the top or back of the refrigerator. Access requires removing the control panel cover.

•How do I test the wiring harness for continuity?

Unplug the refrigerator. Disconnect the wiring harness from both the thermistor and the MCU. Set your multimeter to the continuity setting (beep symbol). Place one probe on one end of the wire and the other probe on the other end of the same wire. If you hear a beep, the wire has continuity.

Amana Refrigerator Error Code E2: Freezer Sensor Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a freezer thermistor at room temperature?

•Where is the MCU located in an Amana refrigerator?

•How do I test the wiring harness for continuity?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: