LG Dishwasher AE Error: Oversudsing Troubleshooting &... | appliancefaults.com

Technical Background:

The main control unit (MCU) monitors the water level and suds level using sensors. The AE error is triggered when the MCU detects an abnormally high suds level, usually indicated by a voltage signal exceeding a pre-programmed threshold on the suds sensor circuit (typically 5V DC circuit). If the sensor is not present, the MCU might be interpreting current draw from the drain pump as a signal for excessive suds.

Symptoms:

The LG dishwasher displays an AE error code on the control panel. The dishwasher may not drain properly and excessive suds are visible inside the tub. The wash cycle might be interrupted.

Possible Causes:

Using excessive detergent, especially detergent pods.
Incorrect type of detergent (non-dishwasher safe).
Malfunctioning drain pump.
Blocked drain hose or air gap.
Faulty suds sensor (if equipped).
Defective main control board.

Solution:

1

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

Manually remove excess suds from the dishwasher tub.
3

Check the drain hose for kinks or blockages. Remove and flush with hot water.
4

Verify the air gap (if installed) is not clogged.
5

Inspect the drain pump for obstructions. Access from inside the tub or underneath the unit. Use a 1/4-inch nut driver.
6

Reset the dishwasher: Press and hold the Start button for 3 seconds. Observe if the error clears.
7

If the error persists, suspect a faulty suds sensor or main control board. Consult a qualified technician for component testing and replacement.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components operate at 120V AC, posing a risk of electrical shock.

Prevention:

Use only dishwasher-specific detergent and follow the manufacturer's recommended amount. Avoid using excessive detergent, especially with soft water. Regularly clean the dishwasher filter and check the drain hose for blockages.

Expert Tip:

To enter service mode on some LG dishwashers, simultaneously press and hold the Half Load and Energy Saver buttons for 3 seconds. This may allow you to run diagnostic tests and clear error codes.

Frequently Asked Questions

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

Locate the suds sensor (if present) near the bottom of the dishwasher. Disconnect the wiring harness. Set your multimeter to measure resistance (Ohms). A normal sensor should show a specific resistance range when dry and a different range when exposed to sudsy water. Refer to the service manual for the exact specifications for your model.

•Where is the drain pump located on my LG dishwasher?

The drain pump is typically located at the bottom of the dishwasher, either inside the wash tub behind a removable panel or underneath the unit. Accessing it may require removing the lower access panel and potentially tilting the dishwasher slightly. Always disconnect power before accessing the pump.

•How much does a new main control board cost for an LG dishwasher?

The cost of a main control board varies depending on the specific model and retailer. Expect to pay between $150 and $350 for a new control board. Labor costs for installation will also apply if you hire a technician.

LG Dishwasher AE Error: Oversudsing Troubleshooting & Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

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

•Where is the drain pump located on my LG dishwasher?

•How much does a new main control board cost for an LG dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: