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LG · Washing Machine

LG Washing Machine PE Error Code

Water level sensor fault

What this error means

PE indicates a Pressure Error—the water level sensor is not sending a valid signal to the main board. The washer may refuse to fill, drain, or advance cycles because it cannot determine how much water is in the tub.

Common causes

  • Air dome hose disconnected or cracked between tub and pressure switch
  • Pressure switch diaphragm failed or clogged with detergent residue
  • Loose wire connector at the pressure sensor on the control board
  • Main control board pressure input circuit damaged

Step-by-step fixes

  1. 1Unplug the washer and locate the thin clear hose running from the tub to the top control housing
  2. 2Remove the hose at both ends and blow through it—air should pass freely with no blockage
  3. 3Reattach the hose firmly to the tub air dome nipple and pressure switch port
  4. 4Run a small load cycle and watch whether fill stops at the correct level

When to call a technician

If the hose is intact and PE returns, the pressure switch or control board input needs bench testing with a multimeter.

Affected models

  • LG WM3400CW
  • LG WM3700HWA
  • LG WT7800CW
Medium30 min

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