GE Dishwasher Error 999: Resetting Leak Sensor by Drying... | appliancefaults.com

Technical Background:

The GE dishwasher’s main control unit (MCU) monitors the leak sensor located in the base pan. When water accumulates, the sensor signals the MCU, triggering error code 999 and shutting down the dishwasher to prevent further damage. The leak sensor operates on a low voltage DC circuit, typically 5V DC. The MCU interprets changes in resistance or voltage to detect the presence of water.

Symptoms:

The GE dishwasher displays error code 999 and may not start or complete a cycle. The user may observe water leaking from the dishwasher or hear an unusual buzzing sound.

Possible Causes:

Water accumulation in the base pan triggering the leak sensor.
Faulty leak sensor itself.
Loose wiring connection to the leak sensor or the main control board.
Defective main control board not properly interpreting the sensor signal.
Clogged drain line causing overflow into the base pan.
Cracked or leaking dishwasher component.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Remove the lower access panel using a 1/4-inch nut driver.
3

Inspect the base pan for any standing water. If water is present, use a shop vac or towels to completely dry the area.
4

Check the leak sensor (usually a small float or sensor at the bottom of the base pan) for any damage or corrosion. Clean or replace if necessary.
5

Verify the wiring connections to the leak sensor and the main control board. Ensure they are secure and free from corrosion. Use a multimeter to check continuity.
6

Restore power to the dishwasher at the breaker panel.
7

Run a test cycle and observe for any leaks or recurrence of the error code.

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 to ensure the breaker remains off during the repair. The dishwasher operates on 120V AC, which can cause serious injury or death if not handled properly.

Prevention:

Regularly inspect the dishwasher’s spray arms, door seals, and drain hose for any signs of damage or wear. Clean the filter and drain regularly to prevent clogs. Avoid overloading the dishwasher, which can cause leaks.

Expert Tip:

After drying the base pan and clearing the error, initiate the dishwasher's diagnostic cycle by pressing and holding the 'Start' and 'Heated Dry' buttons simultaneously for 5 seconds. This will allow the dishwasher to run through its self-test and potentially identify other issues.

Frequently Asked Questions

•How do I test the leak sensor with a multimeter?

Disconnect the leak sensor wiring harness. Set your multimeter to the ohms setting. A good sensor should have a reading close to zero ohms when dry and a high resistance when wet. If you get an open circuit reading when dry, the sensor is likely faulty.

•Where is the main control board located in this GE dishwasher model?

The main control board is typically located behind the upper control panel, inside the door. You will need to disconnect power and remove the outer door panel to access it.

•What type of lubricant should I use on the door seal to prevent leaks?

Use a silicone-based lubricant specifically designed for rubber seals. Avoid petroleum-based products as they can degrade the rubber over time.

GE Dishwasher Error 999: Resetting Leak Sensor by Drying Base Pan

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the leak sensor with a multimeter?

•Where is the main control board located in this GE dishwasher model?

•What type of lubricant should I use on the door seal to prevent leaks?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: