Viking Refrigerator Error Code 2: Troubleshooting Guide... | appliancefaults.com

Technical Background:

Error Code 2 typically indicates a problem with the temperature sensor circuit. The main control unit (MCU) reads the voltage signal from the temperature sensor to determine the temperature inside the refrigerator and freezer compartments. If the voltage signal is out of range (too high or too low), the MCU will trigger Error Code 2. This can be caused by a faulty sensor, wiring issues, or a problem with the MCU itself.

Symptoms:

The Viking refrigerator control panel is displaying Error Code 2 and the lights on the panel are flashing. The refrigerator may not be cooling properly, or the freezer temperature may be fluctuating.

Possible Causes:

Faulty temperature sensor (evaporator or freezer).
Wiring harness issue between the sensor and the control board.
Defective main control board (MCU).
Thermistor failure causing out-of-range readings.
Power supply fluctuations affecting sensor readings.

Solution:

1

Disconnect power to the refrigerator at the breaker panel. Lock-out/Tag-out (LOTO) the breaker.
2

Locate the evaporator and/or freezer temperature sensor(s). These are often located near the cooling coils.
3

Using a multimeter, measure the resistance of the sensor at room temperature (approx. 70°F). Compare the reading to the manufacturer's specifications (typically found in the service manual). An out-of-range reading indicates a faulty sensor.
4

Inspect the wiring harness and connectors between the sensor and the main control board for any signs of damage, corrosion, or loose connections. Repair or replace as needed. A visual inspection may reveal burnt or corroded connector pins.
5

If the wiring and sensor appear to be in good condition, suspect a faulty main control board. Verify power to the board (typically 120V AC) and signal voltage (5V DC). No power indicates a faulty power supply. The voltage readings should be confirmed against factory specs.
6

Replace the main control board with a new, manufacturer-approved replacement. Ensure the new board is properly grounded.
7

Reconnect power to the refrigerator at the breaker panel. Monitor the refrigerator's performance and verify that Error Code 2 is no longer displayed.

Safety Warning:

Always disconnect power to the refrigerator at the breaker panel before performing any troubleshooting or repairs. Refrigerators operate on 120V AC, which can cause serious injury or death. Lock-out/Tag-out (LOTO) the breaker to prevent accidental re-energizing of the circuit.

Prevention:

Regularly clean the refrigerator's condenser coils to ensure proper airflow and cooling. Avoid overloading the refrigerator, as this can strain the cooling system and affect sensor readings. Inspect the door seals regularly and replace them if they are damaged or worn.

Expert Tip:

Some Viking refrigerators have a service mode that allows you to test the temperature sensors and other components. Consult the service manual for instructions on how to enter service mode. The sequence typically involves pressing a specific combination of buttons on the control panel.

Frequently Asked Questions

•Where can I find the technical specifications for the temperature sensor resistance?

The temperature sensor resistance specifications are typically found in the refrigerator's service manual. You can usually download a copy from the Viking website or a reputable appliance parts supplier's website. Search using your model number.

•How do I access the main control board in my Viking refrigerator?

The location of the main control board varies depending on the model. It's usually located behind the control panel or at the back of the refrigerator. Consult the service manual for specific instructions on how to access the board. Typically you'll need a 1/4-inch nut driver and possibly a T-20 Torx driver.

•What is the proper way to test the wiring harness for continuity?

Disconnect the refrigerator from power. Then disconnect the wiring harness from both the sensor and the control board. Set your multimeter to the continuity setting (usually indicated by a sound wave symbol). Place one probe on one end of a wire in the harness and the other probe on the other end of the *same* wire. A beep or a reading of zero ohms indicates continuity. Repeat this process for each wire in the harness. Also, test for shorts to ground by checking each wire to the refrigerator chassis.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where can I find the technical specifications for the temperature sensor resistance?

•How do I access the main control board in my Viking refrigerator?

•What is the proper way to test the wiring harness for continuity?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: