GE Dishwasher Leaking From Bottom: Leak Protect Sensor... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) monitors the Leak Protect sensor, which is typically a float switch or similar device located in the dishwasher's base. When water accumulates, the sensor closes, sending a signal (usually a voltage change) to the MCU. The MCU then initiates a drain cycle and/or shuts down the dishwasher. If the sensor isn't triggering despite a leak, either the sensor itself is faulty, the wiring to the MCU is damaged, or the MCU isn't responding correctly. The voltage path can be checked with a multimeter, expecting typically 5V DC when the sensor is dry and close to 0V DC when wet, or vice versa depending on the specific sensor design.

Symptoms:

The homeowner observes water leaking from the bottom of the GE dishwasher. The Leak Protect sensor is not triggering, meaning the dishwasher is not shutting off automatically to prevent further water damage. Water damage to the kitchen floor is also possible.

Possible Causes:

Cracked or damaged tub
Faulty door seal
Clogged drain pump or hose
Leaking water inlet valve
Damaged spray arm assembly
Internal hose leak

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO).
2

Inspect the door seal for damage, cracks, or debris. Clean or replace as needed.
3

Check the drain hose and pump for clogs or leaks. Remove any obstructions.
4

Examine the water inlet valve for leaks around the connections. Replace if necessary.
5

Inspect the spray arms for cracks or damage. Replace if needed.
6

Using a flashlight, carefully inspect the dishwasher tub for cracks, especially around the heating element and door seal areas.
7

Use a multimeter to test the Leak Protect sensor for continuity when dry and lack of continuity when wet. Check wiring from sensor to the MCU; ensure proper voltage is present (typically 5V DC) using a multimeter.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. This appliance operates on 120V AC, which can cause serious injury or death. Observe Lock Out/Tag Out (LOTO) procedures.

Prevention:

Regularly clean the door seal with a mild detergent. Check the spray arms for clogs and clean them periodically. Run a dishwasher cleaner monthly to prevent buildup and maintain proper drainage.

Expert Tip:

Some GE dishwashers have a service mode. To enter it, press and hold the Start button for 5 seconds, then press Cycle Select, then Start again. This can help you run diagnostics and test components individually.

Frequently Asked Questions

•How do I access the Leak Protect sensor to test it?

Typically, you'll need to remove the lower access panel or kick plate at the front of the dishwasher. The sensor is usually located within the base, near the bottom of the tub. Be sure to disconnect power before accessing the sensor.

•What voltage should I expect to see at the Leak Protect sensor wiring when it's dry and wet?

It depends on the specific GE model, but commonly you will find 5V DC when the sensor is dry and close to 0V DC when wet, indicating the sensor is activated by water presence. Refer to the wiring diagram if available, or test the sensor with a multimeter in both dry and wet conditions to determine the voltage change.

•If the Leak Protect sensor is good and the wiring is intact, what else could be preventing the dishwasher from shutting off?

If the sensor and wiring are good, the problem likely lies with the Main Control Unit (MCU) itself. The MCU may not be processing the signal from the sensor correctly, requiring replacement of the control board.

GE Dishwasher Leaking From Bottom: Leak Protect Sensor Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the Leak Protect sensor to test it?

•What voltage should I expect to see at the Leak Protect sensor wiring when it's dry and wet?

•If the Leak Protect sensor is good and the wiring is intact, what else could be preventing the dishwasher from shutting off?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: