Whirlpool WDT750SAKB Dishwasher Error Code F8 E1: Water... | appliancefaults.com

Technical Background:

The F8 E1 error indicates a problem with the water level sensing system. The MCU (Main Control Unit) relies on the OWI (Optical Water Indicator) to determine the water level inside the dishwasher tub. The OWI sensor sends a signal to the MCU, which then controls the water inlet valve and drain pump. If the MCU detects an abnormal signal from the OWI, it triggers the F8 E1 error.

Symptoms:

The dishwasher displays an F8 E1 error code. The dishwasher may not fill properly, or it may overfill and leak. The wash cycle may not start, or it may stop mid-cycle.

Possible Causes:

Blocked or restricted water inlet valve
Defective water level sensor (OWI – Optical Water Indicator)
Faulty drain pump preventing proper water level sensing
Wiring harness issues between the OWI and the control board
Defective control board (MCU)

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Access the dishwasher and locate the OWI sensor, typically at the bottom of the wash tub. Check for debris or obstructions.
3

Using a multimeter, test the OWI sensor's resistance. Refer to the service manual for the correct resistance range. Expect something around 2-5k ohms.
4

Inspect the wiring harness connecting the OWI sensor to the control board for any damage or loose connections. Repair or replace as needed.
5

Check the voltage at the OWI connector on the control board side. Should be around 5V DC.
6

Inspect the drain pump for proper operation and obstructions. A partially blocked drain can cause inaccurate water level readings. Disassemble and clear any debris.
7

If the OWI sensor and wiring are good, replace the control board (MCU).

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. The control board contains high-voltage components.

Prevention:

Regularly clean the dishwasher filter to prevent debris from entering the drain pump and OWI sensor area. Use a dishwasher cleaner monthly to remove buildup and maintain proper operation.

Expert Tip:

After replacing the control board, run the dishwasher through a diagnostic cycle to ensure all components are functioning correctly. To enter service mode, press and hold the Start/Resume button for 5 seconds then press the following sequence: High Temp, Heated Dry, High Temp, Heated Dry. The diagnostic cycle will take approximately 20 minutes.

Frequently Asked Questions

•What is the exact resistance range of the OWI sensor for this model?

Refer to the Whirlpool WDT750SAKB service manual for the precise resistance range. However, a typical OWI sensor will read between 2k and 5k ohms at room temperature.

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

Disconnect power. Typically, the control board is located behind the access panel at the top of the dishwasher door. You will need to remove screws and carefully detach the panel to expose the control board.

•What is the part number for the OWI sensor and the control board for this model?

The OWI sensor part number is typically W10840142 or a superseding number. The control board part number depends on the specific revision, but a common number is W11087283. Always verify the part number with your supplier using the model number.

Whirlpool WDT750SAKB Dishwasher Error Code F8 E1: Water Level Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the exact resistance range of the OWI sensor for this model?

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

•What is the part number for the OWI sensor and the control board for this model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: