Whirlpool Dishwasher F3 E2 Error: Temperature Sensor... | appliancefaults.com

Technical Background:

The F3 E2 error code indicates the dishwasher's control board (MCU) is detecting an open circuit in the temperature sensor circuit. The MCU sends a small DC voltage (typically 5V DC) through the temperature sensor (thermistor). The resistance of the thermistor changes with temperature, altering the voltage signal returning to the MCU. If the MCU detects no voltage return (open circuit), it assumes the sensor is faulty and displays the error.

Symptoms:

The dishwasher displays an F3 E2 error code. The dishwasher may not heat water properly or at all. Cycles may be interrupted or prolonged.

Possible Causes:

Faulty temperature sensor (thermistor).
Wiring harness issue between the sensor and control board.
Loose connection at the sensor or control board.
Defective control board.
Disconnected or broken wire.
Corroded connector pins.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the temperature sensor. It's typically in the sump area or near the heating element. You might need a 1/4-inch nut driver to remove the access panel.
3

Disconnect the sensor from the wiring harness.
4

Using a multimeter, measure the resistance of the sensor. A typical value at room temperature (70-75°F) is around 50k ohms. An open circuit (infinite resistance) confirms a faulty sensor.
5

Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed. Use dielectric grease on connectors if corrosion is present.
6

If the wiring and connections are good, and the sensor is faulty, replace the temperature sensor with a new one.
7

Reconnect power to the dishwasher and run a test cycle to ensure the F3 E2 error is resolved.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before attempting any repairs. Lock Out / Tag Out (LOTO) procedures should be followed to prevent accidental power restoration. Some components may retain a charge even after power is disconnected. Exercise caution when working near electrical components.

Prevention:

Regularly inspect the dishwasher's sump area for debris buildup. Use a dishwasher cleaner monthly to prevent mineral deposits that can corrode connections. Ensure proper water hardness levels to minimize scaling.

Expert Tip:

Many Whirlpool dishwashers have a service diagnostic mode. To enter, press the following sequence within 6 seconds: High Temp Wash -> Heated Dry -> High Temp Wash -> Heated Dry. This mode runs a series of tests, including the temperature sensor. It will provide more specific error codes if other issues exist.

Frequently Asked Questions

•What is the part number for the temperature sensor on my specific Whirlpool dishwasher model?

The part number for the temperature sensor varies depending on your specific model. You can find the correct part number by checking the dishwasher's parts diagram on the Whirlpool website using your model number or by contacting a parts supplier with your model number.

•How do I access the control board to check the wiring connections?

The control board is typically located behind the dishwasher's front panel or in the top console. Disconnect power first! You may need to remove several screws to access the board. Be careful when disconnecting any wires from the control board, and take pictures beforehand to ensure proper reconnection.

•What should the voltage reading be at the temperature sensor connector with the sensor disconnected?

With the sensor disconnected, you should measure approximately 5V DC at the connector from the control board. This voltage is used to power the thermistor circuit. If you don't measure any voltage, there may be a problem with the control board or the wiring leading to it.

Whirlpool Dishwasher F3 E2 Error: Temperature Sensor Open Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the part number for the temperature sensor on my specific Whirlpool dishwasher model?

•How do I access the control board to check the wiring connections?

•What should the voltage reading be at the temperature sensor connector with the sensor disconnected?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: