LG · Dishwasher
LG Dishwasher PF Error Code
Power interrupted during cycle
What this error means
PF is Power Failure—the control lost AC during operation. It is not a component fault; restart or resume depending on model.
How PF is detected
When PF appears on a LG dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LDF5545ST, LG LDP6797ST, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most PF calls are resolved without parts: reset the breaker or gfci feeding the dishwasher. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If PF returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Tripped kitchen breaker
- Brief outage
- Loose plug on portable dishwasher models
- GFCI outlet trip from moisture
Step-by-step fixes
- 1Reset the breaker or GFCI feeding the dishwasher
- 2Press Start to resume if the display offers continuation
- 3If water sits in the tub, cancel to drain before restarting
- 4Avoid sharing the circuit with microwave and toaster simultaneously
When to call a technician
Frequent PF without breaker trips—inspect terminal connections and cord heat damage.
Affected models
- LG LDF5545ST
- LG LDP6797ST
- LG LDTS5552S
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dishwashers to prevent PF from lint and food debris buildup.
- Record when PF appears in the cycle and whether it clears after a 60-second power reset on your LG dishwasher—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.