Viking Range Error Code F20: Cooling Fan Speed Too Low... | appliancefaults.com

Technical Background:

The Viking range's MCU (Main Control Unit) monitors the cooling fan speed using a feedback signal from a speed sensor integrated into the fan motor. The MCU uses this information to regulate oven temperature and prevent overheating of critical components. The F20 error indicates that the MCU has detected a fan speed below the acceptable threshold.

Symptoms:

The homeowner reports that the Viking range displays an F20 error code on the control panel. The cooling fan, located at the back of the range, might not be running at all, running intermittently, or running at a reduced speed. The oven may overheat or shut down during operation.

Possible Causes:

Blocked cooling fan intake or exhaust.
Faulty cooling fan motor.
Wiring harness issue between the MCU and the cooling fan.
Defective cooling fan speed sensor.
Malfunctioning MCU (Main Control Unit).

Solution:

1

Disconnect power to the range by turning off the breaker at the breaker panel.
2

Locate the cooling fan, typically at the rear of the range. Inspect for obstructions like dust, debris, or pinched wires.
3

Using a multimeter, check the voltage to the cooling fan motor. You should typically see 120V AC when the range is operational and calling for the fan.
4

If voltage is present, test the fan motor itself. Disconnect the fan motor wires and measure the resistance across the motor windings. Compare the reading to the manufacturer's specifications. An open or shorted winding indicates a faulty motor.
5

Inspect the wiring harness and connectors between the MCU and the cooling fan for damage or loose connections. Repair or replace as needed.
6

If the wiring and fan motor test good, the MCU might be faulty. Replacing the MCU is generally a job for a qualified technician.

Safety Warning:

Always disconnect power to the appliance before performing any troubleshooting or repairs. The range operates on 120V AC and 240V AC, which can cause serious injury or death. Follow Lock Out/Tag Out (LOTO) procedures to ensure the circuit remains de-energized during the repair process.

Prevention:

Regularly clean the cooling fan intake and exhaust vents with a vacuum cleaner to remove dust and debris. This will ensure proper airflow and prevent the fan from overheating or failing prematurely.

Expert Tip:

On some Viking ranges, you can access a service mode that allows you to manually control the cooling fan speed and monitor its RPM. Consult the service manual for your specific model to learn how to enter service mode and use its diagnostic features.

Frequently Asked Questions

•Where is the cooling fan located on my specific Viking range model?

The cooling fan is typically located at the rear of the range, either behind a removable panel or accessible from underneath. Consult your range's service manual or owner's manual for the exact location on your model.

•What is the expected resistance reading for a good cooling fan motor?

The resistance reading for a good cooling fan motor varies depending on the motor's specifications. Refer to the range's service manual or the fan motor's documentation for the correct resistance range. A reading of infinity (open circuit) or zero (short circuit) indicates a faulty motor.

•How do I access the service mode on my Viking range to manually test the cooling fan?

The procedure for entering service mode varies depending on the specific Viking range model. Consult your range's service manual for the correct sequence of button presses or control panel inputs required to access service mode. Be cautious when using service mode, as incorrect settings can affect the range's operation.

Viking Range Error Code F20: Cooling Fan Speed Too Low Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the cooling fan located on my specific Viking range model?

•What is the expected resistance reading for a good cooling fan motor?

•How do I access the service mode on my Viking range to manually test the cooling fan?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: