Viking Refrigerator Error Code E22: Defrost Sensor Open... | appliancefaults.com

Technical Background:

The main control unit (MCU) monitors the defrost sensor's resistance to determine the evaporator coil temperature. The MCU uses this data to initiate the defrost cycle. The E22 error code indicates that the MCU is detecting an open circuit or out-of-range resistance from the defrost sensor. The sensor typically operates on a 5V DC circuit with a specific resistance range corresponding to temperature.

Symptoms:

The refrigerator is displaying an E22 error code. The freezer compartment may be excessively frosted up, and the refrigerator compartment may not be cooling properly. The defrost cycle may not be initiating.

Possible Causes:

Defective defrost sensor
Wiring harness damage between the sensor and the main control board
Loose or corroded connections at the sensor or control board
Faulty main control board
Defrost heater malfunction causing sensor overload

Solution:

1

Disconnect power to the refrigerator at the breaker panel.
2

Locate the defrost sensor. It's typically attached to the evaporator coil inside the freezer compartment. Access may require removing evaporator cover panels using a 1/4-inch nut driver.
3

Inspect the wiring harness and connections for any visible damage or corrosion. Repair or replace as needed.
4

Using a multimeter set to ohms, disconnect the sensor and measure its resistance. Compare the reading to the manufacturer's specifications at a known temperature. An open circuit indicates a faulty sensor.
5

If the sensor is faulty, replace it with a new OEM Viking defrost sensor.
6

If the sensor tests good, check the wiring continuity back to the main control board using your multimeter. Look for an open circuit.
7

If the wiring is good, the main control board may be faulty and require replacement.

Safety Warning:

Disconnect power to the refrigerator at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental re-energization. Be aware of potential electrical hazards and use caution when working with electrical components. Some components operate at 120V AC.

Prevention:

Periodically inspect the freezer compartment for excessive frost buildup. Ensure the door seals are clean and intact to prevent air leaks. Avoid overpacking the freezer, which can obstruct airflow and contribute to frost accumulation. Consider cleaning the condenser coils every 6 months to maintain efficient cooling.

Expert Tip:

Some Viking refrigerators have a service mode that allows you to manually initiate a defrost cycle. Consult the service manual for the specific sequence to enter service mode for your model. This can help verify the functionality of the defrost heater and sensor after replacement.

Frequently Asked Questions

•What is the typical resistance range for a Viking defrost sensor at 32 degrees Fahrenheit?

The resistance should be approximately 2.7k to 3.3k ohms. Refer to the service manual for your specific model.

•Where is the main control board located in a typical Viking refrigerator?

It is typically located behind the refrigerator, accessible from the back panel. Some models may have it located behind the upper control panel inside the refrigerator compartment.

•Can a faulty defrost heater cause the E22 error code?

While the E22 code primarily points to the sensor, a shorted or open defrost heater can sometimes indirectly affect the sensor readings or overload the circuit, leading to an error. Always test the heater for proper resistance (typically around 20-40 ohms) after replacing the sensor.

Viking Refrigerator Error Code E22: Defrost Sensor Open Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a Viking defrost sensor at 32 degrees Fahrenheit?

•Where is the main control board located in a typical Viking refrigerator?

•Can a faulty defrost heater cause the E22 error code?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: