Quick answer
Stop after one safe reset; fan motor conditions need detailed service inspection.
Safety note
Disconnect power before opening panels or touching wiring. If water is leaking near electricity, stop and call a qualified technician.
Related problem hub
See more motor or drive fault appliance codes across other brands and appliance types.
What F31 means
On many LG dishwasher models, F31 belongs to the motor or drive fault category. The control cannot confirm normal motor movement, rotation speed, or pump operation.
Codes and exact steps can vary by model number, production year, and regional design. Use this guide as first-pass orientation and confirm model-specific details with the manufacturer source listed below.
Before you start
Write down the full model number and the exact display text before changing parts or clearing the control. Similar-looking codes can map to different model families, and a reset can erase useful timing clues.
If the appliance shows active leaking, a burning smell, smoke, gas odor, repeated breaker trips, or water near power, stop this checklist and use qualified service.
Common causes
- Overloaded drum or rack interference
- Object jammed in pump or impeller
- Drive belt, motor, or hall sensor fault
- Control board fault
Recommended check order
- Confirm the model number and exact code spelling.
- Cancel the cycle and disconnect power before inspecting accessible areas.
- Remove excess load and check whether the drum, basket, or spray arm can move freely.
- Do not force a stuck drum, pump, or spray arm.
- Retry a short empty cycle only if movement is free and no burning smell is present.
- Run one controlled reset only when the appliance is dry, stable, and safe.
- Stop if F31 returns immediately or appears on an empty test.
Safe checks before service
- Cancel the cycle and disconnect power before inspecting accessible areas.
- Remove excess load and check whether the drum, basket, or spray arm can move freely.
- Do not force a stuck drum, pump, or spray arm.
- Retry a short empty cycle only if movement is free and no burning smell is present.
What not to do
- Do not bypass locks, sensors, fuses, or leak protection to force a cycle.
- Do not open powered panels or touch wiring for a code check.
- Do not assume one display code proves one specific part has failed.
Stop and call a technician when
- The motor hums, buzzes, or smells hot.
- Movement is blocked and the obstruction is not visible.
- The code returns with an empty appliance.
FAQ
Is F31 always a broken part?
No. On a LG dishwasher, F31 usually identifies a motor or drive fault category. A blocked hose, dirty filter, uneven load, or unsafe operating condition can trigger a code before a part failure is confirmed.
Can I reset F31?
A single power reset can be reasonable after visible checks are complete and the appliance is safe. If F31 returns immediately, treat it as an active fault rather than a nuisance message.
Why does model number matter?
Brands reuse similar code text across model families. The model number controls the exact manual steps, access points, and service boundary.
Aliases and related display text
People may search for this same condition using different capitalization or alternate display forms.
- F31