An AE error on your LG dishwasher stops the cycle and signals a leak detection fault. The machine's water sensors have detected water where it shouldn't be, and it's shutting down to prevent damage.
But here's what we've learned from 15+ years of AE error calls: roughly half the time, there's no actual leak. The sensor has just been triggered by something else.
This matters because it determines whether you need an expensive repair or just a quick fix.
What the AE Code Actually Means (What We've Found)
The AE error means: "Water has reached the leak sensor, or the sensor is malfunctioning."
Your LG has a float switch under the tub (in most models) that detects standing water. When water reaches a level it shouldn't reach, the float activates and triggers the AE error.
Two possible scenarios:
Scenario 1: There's an actual leak. Water is pooling under the dishwasher tub where the sensor sits. This is a real problem that needs fixing.
Scenario 2: There's no leak, but something has triggered the sensor. The sensor is either malfunctioning, or water reached it through a path that isn't a leak (like overflow from normal operation, or condensation).
After thousands of AE diagnoses, here's what we find:
Roughly 50% of AE errors are actual leaks. The other 50%? Sensor malfunction, installation issues, or normal water reaching the sensor through an unexpected path.
Leak vs. Sensor Malfunction
Before you panic or schedule an expensive repair, answer these questions:
When did the error start? Did it appear suddenly mid-cycle? Did it happen every cycle? Did it happen once and never again?
A sudden error on an older dishwasher might be a degrading seal. A one-time error on a newer machine is more likely a sensor glitch.
Is there actually water under your dishwasher? Open the service panel (bottom-left corner usually) and look inside. Do you see visible water pooling? Feel the area. Is it wet?
If you see no water and the area is dry, you probably don't have a leak. You likely have a sensor issue.
Have you recently installed or moved the dishwasher? Installation mistakes cause most AE errors we see on newer machines. The machine might not be leveled correctly, causing water to pool in unexpected spots.
Is your dishwasher tilted? It should slope slightly toward the back so water drains correctly. If it's level or slopes the wrong direction, water can pool where the sensor sits even if there's no leak.
What We Actually Find When We Investigate AE Errors
An actual leak in the door seal. The rubber gasket around the door degrades or warps, allowing water to escape during operation. We find this more often in humid climates (Sydney, Perth, Brisbane) where the seal deteriorates faster.
You'll see water on the kitchen floor during the cycle, and the area under the machine will be wet. This is fixable with a new door gasket.
A damaged inlet valve. The valve that lets water in can develop a crack or faulty seal, spraying water under the tub instead of into it. Less common, but it happens.
A cracked or loose drain pump connection. The pump sits under the tub. If the fitting connecting it to the pump is loose or cracked, water leaks directly below the sensor.
Improper installation. We see this constantly, especially in DIY installations or newer homes where the builder installed it. The dishwasher isn't leveled correctly, or the mounting brackets are loose, allowing the tub to shift during operation and develop gaps in seals.
A malfunctioning sensor itself. The float switch corrodes, the electrical connection fails, or the sensor housing cracks. It triggers even though there's no leak. We've found corrosion on sensors in coastal homes (Sydney, Perth) due to salt air.
Water pooling from condensation or overflow, not from a leak. In tropical climates (Brisbane), we've seen high humidity cause condensation to collect under the tub where the sensor sits. The sensor triggers, but there's no actual leak to fix.
Normal water reaching the sensor through a path it shouldn't take. Sometimes the drain is positioned slightly wrong, or a seal isn't quite perfect, allowing a small amount of water to drip past the sensor during normal operation. This triggers AE on machines with very sensitive sensors.
What We Do to Diagnose an AE Error
- Step 1: Visual inspection. We look under and around the machine for signs of water. We check if the machine is level using a spirit level.
- Step 2: Access the service panel. We look at the actual leak sensor and assess whether it's wet, corroded, or damaged.
- Step 3: Run a test cycle. We start a cycle and watch where water goes. If we see water escaping where it shouldn't, we've found the leak. If water reaches the sensor but there's no obvious leak source, it's either a positioning issue or a sensor malfunction.
- Step 4: Test the sensor itself. If no leak is apparent, we test the float switch's electrical continuity. A faulty sensor will show incorrect resistance readings.
How to Troubleshoot Before Calling Us
Check for an obvious leak first.
Look under the machine. Is there water pooling? Is the floor wet? If yes, stop using the machine and call us.
If the area under the machine is dry, proceed to the next step.
Check if the machine is level.
Most dishwashers should be very slightly tilted back (maybe 2-3 degrees). If your machine is level or tilts forward, water doesn't drain properly and can pool under the tub.
Check with a spirit level on the top of the appliance. If it's out of level, adjust the front feet (usually by turning a bolt or foot nut at the bottom corners). Tilt it back slightly, then run a test cycle.
Check the door seal.
Open the door and inspect the rubber gasket around all sides. Look for visible cracks, warping, or areas where the rubber is compressed or missing.
If you see damage, the seal needs replacement. If it looks fine, run your finger along the inside of the seal feeling for rough spots or separations. Rough spots can cause leaks.
Clean the seal with warm soapy water and dry it completely. Sometimes dirt prevents a proper seal. A quick clean might solve it.
Test with a short cycle.
Run the shortest cycle available (rinse and hold, if available, or the express/quick wash). Watch the machine during operation. If you see water escaping from the door or bottom, you've likely found a leak.
If no water escapes but the AE error still appears, it's likely a sensor issue.
AE Error Diagnosis Table
| Symptom | Likely Cause | How to Test | Fix |
|---|---|---|---|
| Water under fridge, no error visible | Leak, not sensor issue | Look for actual water pooling | Repair or replace leaky component |
| AE appears every cycle | Sensor malfunction | Clean sensor area with dry cloth | Replace sensor ($100–200) |
| One-time AE, then nothing | False sensor trigger | Check if door was opened mid-cycle | Usually resolves on its own |
| AE + water visible around door | Door gasket failed | Try dollar bill test on seal | Replace gasket ($100–250) |
| AE + machine not level | Installation error | Use spirit level on top | Adjust feet for slight backward tilt |
When It's Actually an Installation Problem
We find a lot of AE errors that turn out to be installation mistakes, especially in homes where the builder installed it or someone did a DIY installation.
Common installation issues:
- The machine isn't secured properly. Check that all mounting brackets are tight. A loose machine can shift during the spin cycle, breaking door seals or moving hose connections.
- The door strike (the part the door catches on) is misaligned. This prevents the door from closing fully, allowing water to escape.
- The drain hose is routed incorrectly. If the drain siphons back into the machine, water can pool under the tub.
- The machine is tilted the wrong direction. Some technicians mistakenly install dishwashers tilted forward. Water should flow backward toward the drain, not forward toward the door.
If you suspect an installation issue, we can often fix it without ordering parts.
Regional AE Error Patterns in Australia
- Coastal areas (Sydney, Perth): Salt air and high humidity cause door seal degradation faster. We see more seal-related AE errors in coastal homes. We recommend seal replacement every 8-10 years in these areas (vs. 12-15 years inland).
- Tropical climates (Brisbane): High humidity and condensation cause more sensor corrosion and false AE triggers. Clean the sensor area monthly if you're in Brisbane and getting repeated AE errors.
- Hard-water regions (Adelaide): Mineral deposits can prevent door seals from seating properly. A mineral-laden seal might trigger an AE error even though it's not technically damaged. Cleaning helps.
- Older Australian homes: We've found AE errors in 1970s and 1980s homes where the plumbing connection is positioned oddly, allowing water to drain toward the sensor instead of away from it. This requires repositioning the drain hose or the machine itself.
What Actually Fixes an AE Error
- If it's a door seal issue: Door gasket replacement, roughly $80-150 for the part, 45 minutes for installation.
- If it's a leveling issue: Adjusting the feet so the machine tilts correctly. Free if you can do it; $100-150 if we do it.
- If it's a sensor malfunction: Sensor replacement, $100-200 for the part, 30-60 minutes for installation.
- If it's a leak in a pump connection or inlet valve: Replacement of the leaking component. Varies by part ($80-250) and labor.
- If it's an installation issue: Repositioning, re-securing, or adjusting components. Often under $200 if we handle it.
All repairs come with a 12-month parts warranty.
Avoiding AE Errors
These practices reduce the chance of an AE error appearing:
- Ensure the dishwasher is level -- Check once yearly that it hasn't shifted
- Clean the door seal regularly -- Monthly with warm soapy water
- Don't slam the door -- Gentle closing extends seal life
- Make sure the machine is fully mounted -- All brackets should be tight
- Keep the drain hose routed correctly -- Don't kink it or position it to siphon backward
- In coastal areas, replace the door seal every 8-10 years -- Preventative seal replacement is cheaper than water damage
- Monitor for early signs of leaks -- Water spots on your floor, a slight smell under the machine. Address these early
Frequently Asked Questions
Is an AE error always a leak?
No. About 50% of AE errors are actual leaks. The other 50% are sensor malfunctions, installation issues, or the machine just being overstuffed. That's why diagnosis is important.
How do I test if my door gasket is sealing properly?
Close a dollar bill or piece of paper in the door. Try to pull it out. If it slides out easily with no resistance, the gasket isn't sealing properly. If it's stuck, the seal is good.
Can leveling the dishwasher really stop an AE error?
Yes, sometimes. If the machine tilts forward instead of slightly back, water pools where the sensor sits. Adjust the front feet so it slopes gently back (maybe 2-3 degrees).
What does a new door gasket cost?
Depending on your LG model, replacement gaskets run $100-250 for the part, plus 20-30 minutes of labor. It's one of the least expensive fixes for repeated AE errors.
Should I be worried if the AE error happened once but hasn't recurred?
Probably not. One-time AE errors are often false triggers from sensor sensitivity or temporary water pooling. If it recurs consistently, then you have a real problem to address.
The Bottom Line
An AE error isn't automatically a serious problem. Half the time, it's a sensor glitch or an installation issue, not a leak.
But you need to know the difference. Start with the troubleshooting steps above. Check for water, verify the machine is level, inspect the seal.
If you find an actual leak or if troubleshooting doesn't help, call National Appliance Repairs for professional diagnosis.
Call 1300 434 380 to book service in your area (Melbourne, Sydney, Brisbane, Perth, Adelaide). Our office team is available Monday-Friday 8:30 AM–7:00 PM, Saturday 8:30 AM–4:30 PM.
We can often diagnose an AE error over the phone and tell you whether it's a DIY fix (leveling), a simple part replacement (sensor), or something more serious. And we'll be honest about what actually needs fixing -- not every AE error requires an expensive repair.
