What this code means
The E1 error on LG dishwashers signals an overfill or leak-protection fault. When the dishwasher detects water where it should not be, a flow switch or float switch in the base pan trips and shuts down the unit to prevent water from leaking onto your floor. LG support documentation confirms that E1 (sometimes shown as AE) appears when an internal leak activates the float switch assembly.
This code does not point to a single broken part. Instead it tells you that water has escaped the tub or sump and collected in the bottom pan below the dishwasher cabinet. The root cause is usually a compromised door gasket, a loose hose clamp, a crack in the sump housing, or the machine sitting out of level so water bypasses the door seal during the wash cycle. Until you find and fix the source of the leak and dry out the base completely, the E1 fault will return each time you try to run a load.
Before You Replace Anything
Homeowners often replace the control board or inlet valve when E1 appears, but the error is a leak sensor responding to real water in the base. Pull the kick plate and check for standing water before ordering electronics.
Common Causes
- Water pooled in the base pan An internal leak from the door seal, sump, hoses, or clamps drips into the leak tray and trips the float switch.
- Damaged or dirty door gasket Grease, food debris, tears, or deformation in the door seal let water escape during the wash and fill cycles.
- Dishwasher not level A tilted cabinet causes water to pool against one side of the door or overflow the sump, bypassing the seal.
- Excess detergent or foam Too much soap creates foam that spills over the tub edge and collects in the base pan.
- Inlet valve sticking open A faulty water valve continues to fill the tub beyond the correct level, triggering overflow protection.
Step-by-Step Fix
- Disconnect power at the circuit breaker or unplug the dishwasher before any inspection or repair work.
- Remove the lower kick plate and look for standing water in the base pan below the tub.
- Soak up all water with towels or a wet-dry vacuum, then let the base air-dry for at least 24 hours (up to 48 hours in humid conditions) so the float switch dries completely.
- Check the dishwasher level by placing a bubble level inside the empty tub and on top of the cabinet, adjusting the front legs until the unit is level front-to-back and side-to-side so the door-to-tub gap is even all around.
- Inspect the door gasket for tears, deformation, grease, or food debris, clean it with warm soapy water and a soft cloth, and replace the gasket if you find cuts or permanent compression.
- Examine internal hoses and clamps at the sump, spray-arm feeds, and drain connections for cracks, splits, or loose clamps, tightening or replacing any suspect components.
- Verify correct detergent use by switching to the manufacturer’s recommended dishwasher detergent and reducing the amount if you see excessive suds during a cycle.
- Restore power and run a short test cycle with the kick plate off so you can watch for new leaks, stopping immediately if water appears in the base.
Parts Often Needed
| Part | Notes |
|---|---|
| LG dishwasher door gasket | Amazon | Match your exact model number for proper fit and seal. |
| Stainless-steel hose clamps | Amazon | Replace any corroded or stripped clamps at sump and hose connections. |
| Water inlet valve | Amazon | Only if testing confirms the valve does not close and the tub overfills. |
When to Call a Pro
Call a professional if you cannot locate the leak source after drying the base and inspecting the door seal, hoses, and clamps. A technician can pressure-test the sump, check the inlet valve electronically, and access internal seals that require cabinet disassembly. Also call for service if the E1 code returns within one or two cycles after you have dried the base and completed basic repairs, because a hidden crack in the tub or a faulty float-switch assembly will need diagnostic tools and OEM parts to resolve safely.