Roper Refrigerator Error Code E2: Freezer Sensor... | appliancefaults.com

Technical Background:

The main control unit (MCU) in the Roper refrigerator monitors the freezer temperature via the freezer thermistor. The thermistor is a temperature-sensitive resistor whose resistance changes with temperature. The MCU supplies a low DC voltage (typically 5V DC) to the thermistor and reads the voltage drop across it. If the MCU detects an out-of-range voltage or no voltage, it interprets this as a fault and displays the E2 error code.

Symptoms:

The homeowner observes an E2 error code displayed on the refrigerator's control panel. The freezer may not be maintaining the correct temperature, and food may be thawing.

Possible Causes:

Faulty freezer thermistor
Wiring harness issue between the thermistor and the main control board
Defective main control board (MCU)
Ice buildup around the thermistor affecting its readings
Loose or corroded connections

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the freezer thermistor, typically near the evaporator coil. It's often a small, encapsulated sensor with wires.
3

Inspect the wiring harness connected to the thermistor for any visible damage, breaks, or corrosion. Check the connector for secure fit.
4

Using a multimeter, measure the resistance of the thermistor. Refer to the Roper service manual for the correct resistance value at a given freezer temperature (e.g., 5k ohms at 0°F). An open or shorted thermistor indicates a fault.
5

If the wiring and thermistor appear good, check the connection at the main control board (MCU). Disconnect and reconnect the connector, ensuring a secure fit.
6

If the thermistor and wiring are good, replace the main control board (MCU).
7

Plug the refrigerator back in and monitor for error code E2. Check freezer temperature after a few hours.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components may retain a high voltage charge even after the appliance is unplugged.

Prevention:

Regularly defrost the freezer to prevent ice buildup around the thermistor. Inspect the wiring harness during routine maintenance. Consider a surge protector to safeguard the control board from voltage spikes.

Expert Tip:

On some Roper models, you can enter service mode by pressing and holding the 'Door Alarm' and 'Freezer Temp' buttons simultaneously for 5 seconds. This will allow you to run diagnostic tests on the thermistor and other components.

Frequently Asked Questions

•What is the typical resistance range for a Roper freezer thermistor at 20 degrees Fahrenheit?

Consult the service manual for the exact value, but typically it's around 10-12k ohms.

•How do I access the main control board on my Roper refrigerator model?

The main control board is usually located at the top rear of the refrigerator, behind a service panel. You'll typically need a 1/4-inch nut driver to remove the panel screws.

•If the thermistor tests good, what other components could cause a false E2 error?

Check the wiring harness for intermittent shorts or opens, and also suspect a faulty main control board (MCU) even if other tests pass. Occasionally, a failing defrost heater can interfere with thermistor readings.

Roper Refrigerator Error Code E2: Freezer Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a Roper freezer thermistor at 20 degrees Fahrenheit?

•How do I access the main control board on my Roper refrigerator model?

•If the thermistor tests good, what other components could cause a false E2 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: