LG Dishwasher IE Error Code: Water Hammer Troubleshooting... | appliancefaults.com

Technical Background:

The IE error code indicates a problem with the water inlet system. The Main Control Unit (MCU) monitors the water level using a flow meter or pressure sensor. If the MCU doesn't detect sufficient water flow within a specified time, it generates the IE error. The MCU sends 120V AC to the water inlet valve to open it during the fill cycle.

Symptoms:

The dishwasher displays the IE error code. You may hear a hammering or banging sound in the water pipes (water hammer). The dishwasher may not fill with water, or fills very slowly.

Possible Causes:

Insufficient water supply pressure (below 20 PSI)
Clogged inlet valve filter
Defective water inlet valve
Faulty flow meter
Drain hose siphon issue causing a vacuum
Main Control Board malfunction

Solution:

1

Turn off the dishwasher and disconnect power at the breaker panel.
2

Check the water supply line for kinks or obstructions. Ensure the water shut-off valve is fully open.
3

Disconnect the water supply line from the inlet valve. Clean the inlet valve filter screen.
4

Reconnect the water supply line. Run the water into a bucket. Check the flow rate (should be at least 1.5 gallons per minute).
5

Using a multimeter, test the voltage to the inlet valve during the fill cycle. You should measure 120V AC.
6

If voltage is present but the valve doesn't open, replace the water inlet valve.
7

Inspect the drain hose for proper system. Ensure it has a high loop to prevent siphoning.

Safety Warning:

Lock Out/Tag Out (LOTO) the breaker before working on the dishwasher. The appliance operates at 120V AC, which can cause electrocution. Wear appropriate safety gear.

Prevention:

Periodically check and clean the inlet valve filter (every 6 months). Ensure adequate water pressure to the dishwasher. Consider installing a water hammer arrestor on the water supply line.

Expert Tip:

Many LG dishwashers have a service mode. To enter, press and hold the 'Rinse' and 'High Temp' buttons simultaneously for 3 seconds. This will allow you to run diagnostic tests and check component functionality.

Frequently Asked Questions

•How do I test the flow meter on my LG dishwasher?

The flow meter is typically tested for continuity. Unplug the dishwasher. Disconnect the flow meter connector and use a multimeter set to Ohms. You should see a resistance value. Check the service manual for the specific resistance range for your model.

•Where is the water inlet valve located on an LG dishwasher?

The water inlet valve is typically located at the bottom of the dishwasher, behind the lower access panel on the left or right side. You'll see the water supply line connected to it.

•What is a water hammer arrestor and how does it prevent water hammer?

A water hammer arrestor is a device installed on the water supply line that absorbs the shock of sudden water pressure changes. It typically contains a chamber filled with air or a spring-loaded piston that cushions the pressure wave, preventing pipes from banging.

LG Dishwasher IE Error Code: Water Hammer Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the flow meter on my LG dishwasher?

•Where is the water inlet valve located on an LG dishwasher?

•What is a water hammer arrestor and how does it prevent water hammer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: