LG dishwasher error code OE

As a rule, the LG dishwasher displays the OE error code at the end of the cycle: the appliance starts the program, but then stops and indicates that the device has detected a drain problem. It means that it is unable to complete the drainage so there is standing water in the bottom.

ОЕ Error Code: Description

This error code lights up on the display when the dishwasher is unable to drain dirty water for a certain period of time (5-10 minutes depending on the model), though the pump can work properly.

Try rebooting the dishwasher to resolve the OE error and eliminate the failure of the self-diagnosis system. Disconnect your dishwasher from the power source and leave it unplugged for 10-15 minutes, then restart the cycle. If it still doesn’t work, inspect the sewer and siphon that may be clogged with food debris and other items which can’t be washed out, causing the water stagnation. Otherwise, the appliance has probably developed a fault.

ОЕ Error Code: Possible Reasons

Actually, LG dishwasher that fails to drain correctly is rather tricky to diagnose since there are plenty of possible reasons for the OE error code to appear. The drain system and related components are the first to blame.

The Filter Is Clogged with Food Debris

Dishwashers use a variety of different filter designs, yet most dishwashers have a 3-stage filter to trap debris. It is located under the spray arms at the bottom of the tank. Regularly cleaning your dishwasher filter is the only way to keep the device performing at its best and not to allow the standing dirty water to provoke the OE error code. Follow these instructions to clean filters:

  • remove the bottom rack of the dishwasher;
  • unscrew impellers;
  • twist the filter counter-clockwise and gently pull it up;
  • disassemble the filter into three parts;
  • hand-wash each part in warm, soapy water, using non-abrasive cleaners.

The only exceptions are dishwashers with self-cleaning filters (known as hard food disposers). Here the OE error code doesn’t relate to filters.

Clogged, Kinked, or Damaged Drain Hose

There is a ridged or corrugated drainage pipe between the dishwasher and the garbage disposal, which serves to transmit water from the dishwasher to the drainage system. Make sure it is:

  • not bent or kinked;
  • not clogged;
  • not damaged.

Confirm a kinked or bent drain hose by straightening it out. Remove and clean by blowing the clogged drain hose. If it is damaged, replace it with a new one. Ordinary drain hose costs about $30, drain hose with assistive devices costs $70.

Clogged Disposal Nozzle

Since the drain hose is connected to the garbage disposal, the water float may be stuck due to the food debris or the errant pieces of dishes. You can use a hammer to remove the water-stop. The clog should be cleaned and unclogged.

Improperly Connected Drain Hose

It is by far the most common defect if you have started a new dishwasher for the first time and suddenly noticed the OE error code on the display. The drain hose should not be too high or too low. Besides, make sure that the drain line is protected against siphonage:

  • air gap;
  • high drain loop.

They prevent contaminated water from backing up into the dishwasher from the sink.

Clogged Air Gap

If the air gap is clogged, it can also lead to your dishwasher not draining properly and the appearance of the OE error. Follow these easy tips to check and fix the air gap problem:

  • turn the appliance off;
  • remove the cover of the air gap and unscrew the plastic cap;
  • remove contaminations with a toothpick or an old toothbrush;
  • pour hot water into the hole;
  • place the covers back.

Check Valve Failure

When the anti-siphon element fails, the dishwasher cannot drain the water, displaying the OE error code. The chief causes for this error code are a stuck check ball or a defective check valve. Use a screwdriver to guide the small plastic ball into the seat and spray a little lubricant to get the parts moving freely and smoothly.

Drain Pump Doesn’t Pump Water

Examine the pump by running forced drainage. Press and hold the Dual Control + Delicate or Half Load + Spray buttons simultaneously (depending on the model of your dishwasher). In case your dishwasher does not have the Cancel & Drain option, start any cycle, let it run for 45 seconds and turn the appliance off (the first 45 seconds of any program is drain only).

Before checking the pump, set the maximum spin speed. If the water is not draining away and the OE error is appearing on the display, listen to hear a humming sound signifying the problem with the pump motor. It might burn out due to power surges or small debris. The cost of a new drain pump is about $50.

In addition, the dishwasher may not drain properly if it has a clogged impeller: the pieces of dishes sometimes get into the impeller. The dishwasher should be partially disassembled to remove the clogs:

  • remove the screws and dismantle the bottom panel;
  • carefully remove the pump by unscrewing the fasteners;
  • dislodge food debris and foreign objects that block the rotation of vanes and provoke the OE error code.

Damaged Pump Wiring

Measure the resistance of the motor. The resistivity level is required to achieve 20-40 Ohm. If the readings are not correct, carefully inspect the electrical circuit from the pump to the board. On older LG appliances, wires tend to stuck in insulation and break. Turn the dishwasher off, remove the door panel and check their integrity. Twist or solder the wire ends together, if necessary.

Faulty Pressure Switch

The pressure switch controls the amount of water in the dishwasher. Unfortunately, it can fail over time. When it happens, the dishwasher “does not detect” the presence of water and does not start draining, thus causing the OE error. The most common reasons for a breakdown include:

  • clogging;
  • oxidation of connector pins;

If it is clogged, the remedy is blowing into the pressure tube to clean it out, while oxidation and wear imply the complete replacing of the assembly.

Faulty Drain Valve

The drain valve is controlled by an electric solenoid that opens the hole. If it gets stuck, water cannot go into the sewer and remains inside, causing the OE error code. Once you have determined the faulty solenoid, the only repair is to replace it.

Faulty Timer

The timer controls the pump motor and the drain valve. When it breaks, the pump will no longer pump water. It is rather easy to identify the problem: there will be no output if the timer doesn’t work.

Damaged Printed Circuit Board

If after checking the abovementioned options LG dishwasher displays the OE error code, you need to inspect the printed circuit board (PCB). It mechanically supports and controls the speed of the pump motor using a Hall-effect sensor. In case of damaged PCB, solder tracks or replace faulty elements. If the processor is broken down, it is advisable to replace the entire control unit.

Author: David Hoover