LG · Dishwasher Serious

PE — Water level sensor error

The pressure/water-level sensor (used on older models) is reporting an implausible value. The control stops the cycle to avoid overfilling or running dry.

Keep using it?
Limited use only
DIY difficulty
Hard
Verified against
lg.com ↗

How to fix it

  1. Power off at breaker for 2 minutes and observe whether PE clears at next start.
  2. Pull the kick plate, locate the pressure switch / sensor, and disconnect its air tube.
  3. Flush the air tube with water and confirm it's not pinched.
  4. Reseat the electrical connector at the sensor and at the main PCB.
  5. Test or substitute the sensor per service-manual values.
  6. If PE persists with a known-good sensor and clear tube, replace the main PCB.

Why it happens

Typical signs: PE displayed early in cycle · Sometimes paired with abnormal fill or drain behavior · Fill phase aborts · Possible flashing of related fill/heat indicators

  • Clogged pressure-sensor air tube Food sludge in the small hose to the sensor distorts readings.
  • Failed pressure sensor Sensor membrane or hall sensor out of calibration.
  • Loose sensor connector Harness backed out at sensor or PCB.
  • Main PCB ADC fault Sensor input channel damaged.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • LG dishwasher pressure sensor Common replacement
    Amazon →

More LG dishwasher codes

2H 2H — Delay-start indicator (2 hours remaining) AE AE — Leak Detected (Aqua Error) bE bE — Bubble / oversuds error CE CE — Motor / communication error CL CL — Child lock / control lock active CR CR — Test / calibration mode

All LG codes → All dishwasher codes →

Frequently asked questions

What does the PE code mean on a LG dishwasher?

The pressure/water-level sensor (used on older models) is reporting an implausible value. The control stops the cycle to avoid overfilling or running dry.

What causes the PE code on a LG dishwasher?

Clogged pressure-sensor air tube: Food sludge in the small hose to the sensor distorts readings. Failed pressure sensor: Sensor membrane or hall sensor out of calibration. Loose sensor connector: Harness backed out at sensor or PCB.

Is it safe to keep using a LG dishwasher with a PE error?

Limited use only. This is rated a serious-severity fault.

How do I fix PE on a LG dishwasher?

Power off at breaker for 2 minutes and observe whether PE clears at next start. Pull the kick plate, locate the pressure switch / sensor, and disconnect its air tube. Flush the air tube with water and confirm it's not pinched.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.