Before you start: quick safety prep

• Turn power off at the dishwasher or breaker before you reach under the sink or pull the unit.
• Have a towel or shallow pan ready — checking drain lines can spill water.
• If you’ve had standing water for a while, expect odors; that’s normal with a drain restriction.

Step 1: Try a reset + “drain only” test

1. Turn the dishwasher off.
2. Wait 60 seconds, then turn it back on.
3. Start a cycle and cancel/drain (or run the machine’s drain function if your model has one).

If it drains strongly and the OE doesn’t return, you may have had a temporary hiccup. If OE returns quickly, keep going below.

Step 2: Check the easiest cause — the filters

LG dishwashers commonly throw OE when food debris blocks the filter area. Pull the lower rack, remove the filters per your model’s design, and rinse/clean thoroughly. Reinstall everything securely and try another drain test.

Tip: If the dishwasher has standing water, remove what you can with a cup/turkey baster first so you can see what you’re doing.

Step 3: Look under the sink for a drain hose kink or clog

Open the cabinet under your sink and find the dishwasher drain hose. Common issues:

• Kinked or pinched hose (something shoved against it, or the hose bent too sharply).
• Grease/food buildup inside the hose or at the connection point.
• Improper routing (a messy loop can trap gunk; a proper “high loop” helps prevent backflow).

Straighten the hose and clear any visible debris at the connection points, then test drain again.

Step 4: New install? Verify the garbage disposal knockout plug is removed

If your dishwasher drains into a garbage disposal, and the dishwasher is newly installed (or the disposal was recently replaced), this is a top culprit. Many disposals ship with a solid knockout plug blocking the dishwasher inlet. If it’s not removed, the dishwasher cannot drain and OE appears.

What to do: Confirm the dishwasher inlet on the disposal is open (a plumber or technician can handle this quickly if you’re unsure).

Step 5: If you have an air gap, check it for blockage

Some homes use a small air gap fitting at the sink. Debris can clog it and cause OE. Clean out the air gap and flush it with hot water, then re-test.

Step 6: Check the sink drain itself

Sometimes the dishwasher is fine — the sink drain is the bottleneck. If your sink drains slowly or backs up, that restriction can trigger dishwasher drain issues too.

When it’s likely a part problem

If you’ve cleared the filters and verified the hose/air gap/disposal connection, but the dishwasher still won’t drain, the issue may be inside the unit. Common suspects include:

• Drain pump (weak, jammed, or failed)
• Drain check valve (stuck or broken)
• Drain hose (internal clog or deterioration)
• Control or wiring (less common, but possible)

Clue: If you hear the pump humming but little/no water moves, think restriction or a jammed check valve. If you hear nothing during drain, think pump power/control/wiring.

When to call Beacon

If you’ve done the quick checks above and OE keeps returning, it’s usually faster (and safer) to have a technician confirm whether it’s a clog in the drain path or a failing drain pump/check valve.

For homeowners in Citrus County and nearby Florida communities, our friendly technicians in yellow can diagnose the cause, protect your cabinets from leaks, and get the dishwasher draining correctly again.

Request service online or call (352) 726-7530. You can also visit www.BeaconSaves.com.