GE Dishwasher Error Code 999: Troubleshooting and Reset Guide
Fix GE dishwasher error 999 with a final reset after a leak. Step-by-step guide to resolve the issue quickly. Learn how!
Fix GE dishwasher error 999 with a final reset after a leak. Step-by-step guide to resolve the issue quickly. Learn how!
The floor protect pan sensor is usually located at the very bottom of the dishwasher, inside the metal base frame. You will usually need to remove the lower access panel to see it.
Typically, you should see around 5V DC at the sensor connector when the dishwasher is powered on and the sensor is not triggered. This voltage is supplied by the main control board.
Yes, if you've confirmed the sensor is dry, the wiring is intact, and the sensor itself tests good (using an ohmmeter), then the main control board (MCU) is likely the cause of the error. A faulty MCU may not be properly interpreting the sensor signal.
The MCU (Main Control Unit) monitors the floor protect pan sensor. This sensor is typically a float switch or a conductivity sensor that detects the presence of water in the pan. When water is detected, the sensor signals the MCU, which triggers error code 999 and prevents further operation to prevent damage. The sensor typically operates on a low voltage (5V DC) circuit.
Always disconnect power to the dishwasher at the breaker panel before performing any repairs. High voltage is present inside the appliance, and improper handling can result in electric shock. Use proper Lock-Out/Tag-Out (LOTO) procedures.
Regularly inspect the dishwasher for leaks around the door seal, pump, and water inlet valve. Ensure the drain hose is properly connected and not kinked. Clean the filter regularly to prevent blockages.
To enter the diagnostic mode on most GE dishwashers, press and hold the Start button, then press the Select Cycle button three times within four seconds. This will initiate a self-test cycle that may help pinpoint the source of the error. Run a calibration cycle after replacing the sensor or the main control board.