How to Reset an LG Washer: All Methods

Updated · from manufacturer service documentation

A sensor or code reset gives the control a fresh reading and can clear a stuck fault once you've already fixed (or ruled out) the underlying cause. On LG's top-load platform, several sensor-related faults are specifically documented to clear by entering and exiting the test mode.

Sensor Reset via Test Mode Entry/Exit

For several documented sensor faults (including issues with the I-SENSOR), LG's service procedure is simply to reset the sensor by entering and exiting the test mode — no separate reset button exists for these; cycling through test mode itself clears the stuck reading.

Entering QC Test Mode

  1. Make sure the washer is empty and the controls are off.
  2. Press and hold the WASH/RINSE and SOIL LEVEL buttons, then press POWER. The buzzer sounds twice to confirm entry.
  3. Press Start/Pause to advance through subsequent test mode steps.

If the Code Comes Back

If a sensor fault clears after a test-mode reset but returns right away, the reset only cleared the reading — the underlying sensor or connection issue is still present. Check the connections at the pressure switch and the main board connector before assuming the sensor itself needs replacing.

Frequently Asked Questions

How do I reset a stuck sensor reading on an LG washer?

Enter and exit the test mode — this is the documented reset method for several sensor faults on the top-load platform, rather than a dedicated reset button.

How do I enter LG's QC Test Mode?

With the washer empty and controls off, press and hold WASH/RINSE and SOIL LEVEL, then press POWER. The buzzer sounds twice to confirm you're in test mode.

Will a sensor reset fix my washer for good?

Only if the sensor or its connections are actually fine — if the fault returns immediately after reset, check the physical connections first before replacing the sensor.

Is there a different reset for a fully unresponsive washer?

The service documentation for this platform doesn't list a general power-cycle procedure beyond the test-mode sensor reset above; for a washer that's completely unresponsive, check power supply first.

How do I tell if the pressure switch itself has failed, instead of just needing a reset?

Read it in test mode: the service documentation gives a normal initial reading range of 60–104. If the pressure switch reads below 60 or above 104 in test mode, the switch has failed and needs replacing rather than just resetting — no amount of sensor-reset will fix a bad switch. Before replacing anything, also check the air hose between the tub and the pressure switch for blockages or leaks; a bad seal there can produce the same out-of-range reading as a failed switch.

Based on the LG service documentation for the top-load (MFL40322141) washer series. Last updated: .