Whirlpool Oven Cooling Fan Running Too Long:... | appliancefaults.com

Technical Background:

The main control unit (MCU) in the oven monitors the oven temperature sensor (RTD). Based on the temperature readings, the MCU controls the cooling fan relay, supplying 120V AC to the cooling fan motor. The fan is intended to cool down the oven components after cooking. Voltage paths run from the breaker panel, through the MCU relay, and to the fan motor.

Symptoms:

The cooling fan on a Whirlpool oven continues to run for approximately 2 hours after a bake cycle has completed. This is significantly longer than expected.

Possible Causes:

Faulty oven temperature sensor (RTD).
Stuck cooling fan relay on the control board.
Damaged wiring harness to the cooling fan.
Defective main control board (MCU).
Overly high initial oven temperature.
Blocked oven vents causing slower cooling.

Solution:

1

Disconnect power to the oven at the breaker panel.
2

Locate the oven temperature sensor (RTD) and test its resistance using a multimeter. Refer to the Whirlpool service manual for the correct resistance value at room temperature (typically around 1080 Ohms at 77°F).
3

Check the cooling fan relay on the main control board for continuity when the oven is cold. If the relay shows continuity when it should be open, replace the control board.
4

Inspect the wiring harness connecting the control board to the cooling fan for any signs of damage (burns, cuts, or loose connections).
5

Using a multimeter, verify 120V AC is reaching the cooling fan motor during the extended run time. If voltage is present when it shouldn't be, the control board is likely the issue.
6

If no voltage is present, but the fan should be running, replace the cooling fan motor.
7

Reconnect power to the oven and test.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. Lockout/Tagout (LOTO) procedures should be followed to prevent accidental energization. High voltage is present within the appliance; exercise caution.

Prevention:

Regularly clean oven vents to ensure proper airflow. Avoid setting the oven temperature excessively high. Check oven sensor resistance annually.

Expert Tip:

Many Whirlpool ovens have a service mode. Entering this mode often displays error codes and allows for component testing. Consult the service manual for your specific model for instructions on accessing and using the service mode. This can significantly speed up diagnostics.

Frequently Asked Questions

•What is the correct resistance value for the oven temperature sensor (RTD) at a specific temperature?

The resistance value of the RTD varies with temperature. Consult the Whirlpool service manual for your specific model. Typically, it's around 1080 Ohms at 77°F, and increases with temperature.

•How do I access the service mode on my Whirlpool oven?

The procedure for accessing service mode varies by model. Usually, it involves pressing a specific sequence of buttons on the control panel. Refer to your oven's service manual for the exact steps.

•Where is the cooling fan relay located on the main control board?

The cooling fan relay is usually a small, rectangular component on the main control board. Its location is generally marked on the board itself, often with a label such as 'Cooling Fan Relay' or similar. A schematic diagram can help pinpoint it.

Whirlpool Oven Cooling Fan Running Too Long: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance value for the oven temperature sensor (RTD) at a specific temperature?

•How do I access the service mode on my Whirlpool oven?

•Where is the cooling fan relay located on the main control board?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: