GE Dishwasher Error Code 999: Leveling for Sensor Reset... | appliancefaults.com

Technical Background:

error code 999 often indicates a problem with the dishwasher's tilt sensor. This sensor is designed to detect when the dishwasher is not level or has been tilted excessively, preventing operation to avoid water damage. The MCU monitors the voltage signal from the tilt sensor. When the sensor detects an out-of-level condition, it sends a signal to the MCU, triggering the error code and halting the wash cycle.

Symptoms:

The dishwasher displays error code 999 and may not start or complete a cycle. The homeowner might also notice excessive noise or vibration during operation.

Possible Causes:

Dishwasher is not level causing sensor malfunction.
Faulty leveling feet.
Obstructed or malfunctioning tilt sensor.
Wiring harness damage to the tilt sensor.
Main Control Unit (MCU) failure.
Incorrect voltage supply to the sensor.

Solution:

1

Unplug the dishwasher or turn off the breaker at the breaker panel.
2

Using a level, check the dishwasher's front-to-back and side-to-side level. Adjust the leveling feet with a 1/4-inch nut driver until the dishwasher is level.
3

Locate the tilt sensor, typically at the base. Inspect for any obstructions or damage.
4

Using a multimeter, check the wiring harness to the tilt sensor for continuity. Repair or replace any damaged wires.
5

Check the voltage to the tilt sensor using your multimeter. You should read approximately 5V DC.
6

If the wiring and sensor appear functional, suspect a faulty MCU. Replacement of the MCU may be necessary.
7

After leveling and checking sensor, run a diagnostic cycle to clear 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 must be followed to prevent accidental energization. High voltage is present in the appliance.

Prevention:

Regularly check the dishwasher's leveling and ensure no objects are obstructing the leveling feet. Avoid overloading the dishwasher, which can contribute to imbalance and sensor errors.

Expert Tip:

After making any repairs, enter the dishwasher's service mode (usually accessed by pressing a specific sequence of buttons – consult the service manual for your specific model). Run a full diagnostic cycle to ensure all systems are functioning correctly and the error code is cleared.

Frequently Asked Questions

•How do I access the diagnostic cycle on my specific GE dishwasher model?

The diagnostic cycle access varies by model. Consult your dishwasher's service manual or search online using your model number to find the correct button sequence.

•Where is the tilt sensor typically located in a GE dishwasher?

The tilt sensor is usually located at the base of the dishwasher, often near one of the front corners. It's a small electronic component connected to a wiring harness.

•What is the correct voltage reading I should expect at the tilt sensor?

You should expect to see around 5V DC at the tilt sensor. This confirms the sensor is receiving power from the MCU.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the diagnostic cycle on my specific GE dishwasher model?

•Where is the tilt sensor typically located in a GE dishwasher?

•What is the correct voltage reading I should expect at the tilt sensor?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: