LG Dishwasher AE Error: Troubleshooting Water in Pan -... | appliancefaults.com

Technical Background:

The AE error code on an LG dishwasher typically indicates a water leak has been detected. The dishwasher's Main Control Unit (MCU) monitors the float switch in the base pan. When water accumulates and raises the float, the switch closes, signaling a leak. This triggers the AE error and often activates the drain pump. The MCU reads a voltage from the float switch circuit, usually a 5V DC signal that changes state when the float rises.

Symptoms:

The LG dishwasher displays an AE error code, and there is water standing in the base pan beneath the dishwasher.

Possible Causes:

Leaking water inlet valve.
Faulty drain pump seal.
Cracked or damaged sump assembly.
Loose or damaged hose connections.
Defective float switch.
Overflowing water due to incorrect detergent usage.

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO - Lock Out Tag Out).
2

Remove the lower access panel and inspect for standing water in the base pan.
3

Use a shop vacuum to remove any standing water.
4

Inspect the water inlet valve and drain pump for leaks. Replace if necessary.
5

Check all hose connections for tightness and signs of damage. Tighten or replace as needed, using a 5/16-inch nut driver for hose clamps.
6

Examine the sump assembly for cracks or damage. Replace the sump if necessary.
7

Test the float switch for proper operation using a multimeter. It should show continuity when the float is raised and no continuity when lowered. Replace if faulty.
8

Reconnect the power and run a test cycle to verify the leak is resolved. Monitor for further leaks.

Safety Warning:

Always disconnect the power supply to the dishwasher at the breaker panel before performing any repairs. High voltage (120V AC) is present within the unit, and failure to disconnect power could result in serious injury or death.

Prevention:

Regularly inspect hose connections for tightness. Use the correct type and amount of dishwasher detergent. Periodically clean the dishwasher's interior with a dishwasher cleaner to prevent buildup and potential leaks.

Expert Tip:

To quickly pinpoint the leak source, add a small amount of dishwasher-safe dye to the dishwasher tub. Run a short cycle. The dye will help trace the source of the leak more easily. Some LG dishwashers have a diagnostic mode accessible by pressing and holding specific button combinations (consult the service manual for your specific model).

Frequently Asked Questions

•How do I test the float switch with a multimeter?

Set your multimeter to the continuity setting (usually indicated by a diode symbol or a sound). Disconnect the wires from the float switch. Place the multimeter probes on the switch terminals. Manually raise the float. The multimeter should show continuity (a beep or a reading close to zero ohms) when the float is raised and no continuity (OL or infinity reading) when the float is lowered.

•Where is the water inlet valve located in my LG dishwasher?

The water inlet valve is typically located at the back of the dishwasher, near the bottom. You'll usually need to remove the lower access panel to see it. It will have a water supply line connected to it and an electrical connector.

•What type of detergent should I use to prevent overflow issues?

Use only detergents specifically designed for automatic dishwashers. Avoid using hand dish soap, as it creates excessive suds that can lead to overflow and leaks. Powdered or gel packs are generally recommended and use the recommended amount in the user manual.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the float switch with a multimeter?

•Where is the water inlet valve located in my LG dishwasher?

•What type of detergent should I use to prevent overflow issues?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: