LG · Dryer
LG Dryer PF Error Code
Power lost during cycle
What this error means
PF is Power Failure—the board lost AC during operation. It is informational, not a parts fault. Some LG models let you resume; others require restarting the cycle.
How PF is detected
LG dryer models lock the door or lid before energizing fill, heat, or high-speed spin. PF means the latch switch never sent a "locked" signal to the main control, or the lock motor did not complete its travel. On LG DLEX3900W, LG DLE3400W, and similar variants, clothing caught in the gasket, a misaligned strike, or a failed latch assembly are the most common mechanical causes—not the board itself.
Inspect the door gasket perimeter and strike alignment before replacing the latch. Tripped 30A dryer breaker is reported frequently on this code. After correcting mechanical issues, check the breaker and reset if tripped. If the latch clicks but PF persists, the door lock switch or wiring harness to the control board likely needs testing with a multimeter.
Do not force the door open during an active cycle; wait for the lock to release when the board de-energizes the lock motor—usually two to three minutes after canceling power on most LG units.
Common causes
- Tripped 30A dryer breaker
- Brief outage or brownout
- Loose cord at the terminal block
- Using an undersized extension cord on 120V compact dryers
Step-by-step fixes
- 1Check the breaker and reset if tripped
- 2Press Start to resume when the display prompts
- 3Tighten terminal block screws if the cord was recently installed
- 4Avoid sharing the laundry circuit with space heaters or window AC units
When to call a technician
Frequent PF with no breaker trips suggests a failing cord, outlet, or main board power supply.
Affected models
- LG DLEX3900W
- LG DLE3400W
- LG DLE7300WE
Prevention & maintenance
- Wipe the door gasket weekly and avoid overloading items against the seal—PF often starts as a slow leak or latch misalignment.
- Record when PF appears in the cycle and whether it clears after a 60-second power reset on your LG dryer—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for PF; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting PF; reversed plugs on pumps and valves cause immediate repeat faults.