Whirlpool Dishwasher F8 E1 Error: Thermistor Probe... | appliancefaults.com

Technical Background:

The F8 E1 error code indicates a thermistor malfunction. The thermistor is a temperature-sensitive resistor that provides temperature feedback to the main control unit (MCU). The MCU uses this information to regulate the heating element and ensure proper wash and dry cycles. An abnormal thermistor reading (open circuit, short circuit, or out-of-range resistance) triggers the F8 E1 error. The MCU monitors voltage from the thermistor circuit, and an incorrect voltage level indicates a fault.

Symptoms:

The dishwasher displays the F8 E1 error code, and the wash cycle may be interrupted. The dishwasher might not heat the water properly.

Possible Causes:

Faulty thermistor
Wiring harness issues (open or shorted)
Loose connections at the thermistor or control board
Defective control board (MCU failure)
Excessive moisture interfering with the thermistor reading
Debris buildup around the thermistor

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify no voltage with a non-contact voltage tester.
2

Locate the thermistor, usually at the bottom of the dishwasher tub near the heating element.
3

Disconnect the thermistor connector. Inspect the connector and wiring for corrosion or damage.
4

Using a multimeter set to ohms, measure the resistance of the thermistor. Refer to the service manual for the correct resistance value at room temperature (typically around 50k ohms at 77°F).
5

If the thermistor resistance is outside the specified range, replace the thermistor.
6

If the thermistor tests good, reconnect the thermistor and check the wiring harness continuity from the thermistor connector to the control board connector. Repair any open or shorted wires.
7

If the wiring is good, the control board may be defective. Replace the control board.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components may retain a residual electrical charge. Exercise caution when working near electrical components.

Prevention:

Periodically inspect the dishwasher interior for debris buildup around the thermistor. Use a dishwasher cleaner regularly to prevent mineral deposits and buildup that can affect thermistor performance.

Expert Tip:

Many Whirlpool dishwashers have a diagnostic mode. To enter diagnostic mode, press the following sequence of buttons within 6 seconds: High Temp Wash -> Heated Dry -> High Temp Wash -> Heated Dry. The control panel will then display error codes and allow you to run diagnostic cycles. Clear the codes after repair.

Frequently Asked Questions

•What is the correct resistance range for the thermistor on this model?

Refer to the service manual for the specific resistance range. Typically, it's around 50k ohms at 77°F, but variations exist.

•How do I access the control board on this dishwasher?

The control board is usually located behind the control panel. You'll need to remove the outer door panel and disconnect any ribbon cables or connectors before accessing the board. Disconnect power first.

•What type of thermistor should I use as a replacement?

Use the exact replacement thermistor specified for your model. Using a generic thermistor may result in inaccurate temperature readings and further problems.

Whirlpool Dishwasher F8 E1 Error: Thermistor Probe Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the thermistor on this model?

•How do I access the control board on this dishwasher?

•What type of thermistor should I use as a replacement?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: