Viking Range Error Code 300: Temperature Sensor Drift... | appliancefaults.com

Technical Background:

The range's main control unit (MCU) monitors the oven temperature via a resistance temperature detector (RTD). The RTD's resistance changes with temperature, sending a corresponding voltage signal back to the MCU. Error 300 indicates the MCU detects a signal outside the acceptable range, suggesting a sensor fault or wiring issue.

Symptoms:

The oven may take an excessively long time to preheat, or it may not reach the set temperature at all. The temperature displayed on the control panel may be inaccurate or fluctuate wildly. Error code 300 is displayed.

Possible Causes:

Faulty oven temperature sensor (RTD).
Wiring harness damage between the sensor and the control board.
Loose connection at the sensor or control board.
Defective relay on the control board.
MCU failure.
Excessive oven temperature fluctuations.

Solution:

1

Disconnect power to the range at the breaker panel (Lock Out/Tag Out procedure).
2

Locate the oven temperature sensor (RTD) inside the oven cavity, usually at the rear.
3

Disconnect the sensor wiring from the control board, often located behind the control panel.
4

Using a digital multimeter, measure the resistance of the sensor at room temperature (approx. 70°F). Refer to the Viking service manual for the expected resistance value (typically around 1080 ohms at 70°F).
5

Inspect the wiring harness for any signs of damage, such as cuts, frayed wires, or corrosion. Repair or replace as needed.
6

Check the connections at the sensor and control board for looseness or corrosion. Clean or tighten as needed.
7

If the sensor resistance is out of range or the wiring is damaged, replace the oven temperature sensor.

Safety Warning:

Disconnect power to the range at the breaker panel before performing any troubleshooting or repairs. High voltage is present inside the appliance, which can cause serious injury or death.

Prevention:

Avoid extreme temperature variations in the oven. Do not spill liquids on the oven sensor during cleaning. Schedule a yearly licensed technician inspection. Check the oven vent for obstructions.

Expert Tip:

After replacing the sensor, calibrate the oven temperature using the oven's service mode. Access the service mode by pressing and holding the 'Bake' and 'Broil' buttons simultaneously for 5 seconds. Follow the on-screen prompts to calibrate the temperature.

Frequently Asked Questions

•What is the typical resistance value of the RTD sensor at room temperature?

The typical resistance value of the RTD sensor at room temperature (approximately 70°F) is around 1080 ohms. Always consult the Viking service manual for the exact specification for your specific model.

•Where is the oven temperature sensor located in the Viking Range?

The oven temperature sensor is typically located at the rear of the oven cavity. You may need to remove the rear oven panel to access it.

•What voltage should I expect to see at the oven temperature sensor connector?

You should not measure a significant voltage at the oven temperature sensor connector with the sensor disconnected. The sensor is a passive device (RTD) that changes resistance, not a voltage source. The control board provides a small current through the sensor to measure the resistance change.

Viking Range Error Code 300: Temperature Sensor Drift Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance value of the RTD sensor at room temperature?

•Where is the oven temperature sensor located in the Viking Range?

•What voltage should I expect to see at the oven temperature sensor connector?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: