LG Dishwasher OE Error Code: Troubleshooting and Drain... | appliancefaults.com

Technical Background:

The 'OE' error code on an LG dishwasher indicates a drain error. The Main Control Unit (MCU) monitors the water level and drain pump operation. If the MCU detects that the water level is not decreasing within a specified time frame after activating the drain pump relay, it triggers the 'OE' error. Voltage is supplied to the drain pump via the drain pump relay located on the main control board.

Symptoms:

The LG dishwasher displays an 'OE' error code and does not drain properly. Water remains at the bottom of the tub after a wash cycle. The dishwasher may emit a humming sound during the drain cycle, or no sound at all.

Possible Causes:

Clogged drain hose
Failed drain pump
Obstruction in the drain pump impeller
Defective drain pump relay on the control board
Blocked air gap or drain line
Siphon issue with drain hose connection

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify 0V AC at the dishwasher outlet with a multimeter.
2

Inspect the drain hose for kinks or clogs. Remove the hose and flush with hot water.
3

Access the drain pump, typically located at the bottom of the dishwasher. Check for obstructions in the pump impeller. Remove any debris.
4

Test the drain pump for continuity using a multimeter. A reading of approximately 20-50 ohms is typical. Replace the pump if open or shorted.
5

Locate the drain pump relay on the control board. Visually inspect for burnt or damaged components.
6

With power restored, check for 120V AC at the drain pump relay when the dishwasher is attempting to drain. If voltage is present but the pump isn't running, the pump is faulty. If no voltage is present, the relay or control board is suspect.
7

Replace the control board or relay (if available as a separate component) if necessary.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Use appropriate safety precautions when working with electrical components. Lock Out / Tag Out (LOTO) procedures must be followed to prevent accidental energization. High voltage is present when the dishwasher is powered on.

Prevention:

Regularly clean the dishwasher filter and inspect the drain hose for obstructions. Ensure the air gap (if installed) is clear. Avoid overloading the dishwasher with excessive food debris.

Expert Tip:

Some LG dishwashers have a service mode that allows you to manually activate the drain pump. This can be helpful for testing the pump and identifying the source of the problem. Consult the service manual for your specific model for instructions on accessing the service mode.

Frequently Asked Questions

•How do I access the drain pump on my LG dishwasher?

The drain pump is typically located at the bottom of the dishwasher tub. You will usually need to remove the lower spray arm, filter assembly, and any lower access panels to gain access. Refer to your specific model's service manual for detailed instructions and diagrams.

•What is the proper way to test the drain pump relay on the control board?

First, visually inspect the relay for any signs of damage. Then, use a multimeter to check for continuity across the relay coil. You should also check for voltage (typically 120V AC) at the relay terminals when the drain cycle is activated. If there is no voltage, the control board may be faulty.

•Where can I find the service manual for my specific LG dishwasher model?

You can often find the service manual online by searching for your model number followed by 'service manual' on websites like AppliancePartsPros.com or RepairClinic.com. You can also try contacting LG directly or consulting a qualified appliance repair technician.

LG Dishwasher OE Error Code: Troubleshooting and Drain Pump Relay Test

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on my LG dishwasher?

•What is the proper way to test the drain pump relay on the control board?

•Where can I find the service manual for my specific LG dishwasher model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: