LG Dishwasher 1E Error Code: Water Level Sensor Fault
Quick Answer
1E on an LG dishwasher means the water level pressure sensor sent a signal outside the expected range. The pressure sensor works by detecting air pressure in a small chamber connected to the tub bottom. If the sensor tube is clogged with scale or food debris, the sensor reads incorrectly even though the component itself is fine.
1E on an LG dishwasher means the water level pressure sensor sent a signal outside the expected range. The pressure sensor works by detecting air pressure in a small chamber connected to the tub bottom. If the sensor tube is clogged with scale or food debris, the sensor reads incorrectly even though the component itself is fine. Cleaning the sensor tube is the free first step. If the sensor tube is clear, the pressure sensor itself needs replacement.
What Does the 1E Code Mean?
1E is a water level pressure switch fault. Check the sensor tube for scale or debris first before replacing the pressure sensor (6601ER3003B, $15-28).
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Symptoms You May Notice
- 1E displayed during or after fill cycle
- Dishwasher may overfill or underfill
- Cycle aborts at fill stage
- Inconsistent fill levels across cycles
Can you reset a Lg dishwasher to clear the 1E code?
After clearing the sensor tube or replacing the pressure sensor, unplug for 60 seconds and restart. Run a short cycle and confirm the dishwasher fills normally and 1E does not reappear.
Tools Required for Diagnosis
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Disconnect power
Disconnect power. Locate the pressure sensor and its connecting tube under the tub -- typically accessible from the toe kick panel area. Disconnect the pressure tube from the sensor and blow gently through it to check for blockage. Also check the tub end of the tube.
Disconnect the wiring harness from the pressure sensor
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
| Part Name | OEM Number | Estimated Price |
|---|---|---|
| Water Level Pressure Sensor6601ER3003B · $15–$28 | 6601ER3003B | $15 – $28 |
Repair vs. Replace Calculator
Frequently Asked Questions
Is 1E the same as IE on LG dishwashers?
Related Lg Dishwasher Error Codes
Same Fix Works on These Brands
Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.
Models Known to Experience 1E Errors
This repair applies to most Lg dishwashers with this error code. Common model numbers include:
LDFN4542D, LDF5545ST, LDFS5788S, LDP6763ST, LDFN3432T, LDFN4542S, LDFN4542W
Last verified for technical accuracy on March 14, 2026