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LG Dishwasher PE — Water level sensor error

LG Dishwasher · Error code PE

What PE Means

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.

Symptoms

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

Common Causes

1
Clogged pressure-sensor air tube

Food sludge in the small hose to the sensor distorts readings.

2
Failed pressure sensor

Sensor membrane or hall sensor out of calibration.

3
Loose sensor connector

Harness backed out at sensor or PCB.

4
Main PCB ADC fault

Sensor input channel damaged.

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.

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.

Common replacement LG dishwasher pressure sensor View on 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 →

Verified against manufacturer documentation: lg.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.