LG · Refrigerator
LG Refrigerator gF Error Code
Flow sensor on water line fault
What this error means
gF is a Flow sensor error on LG fridges with measured water dispensers or ice makers. The board expected a pulse count from the inline flow meter during fill and saw none or too few.
How GF is detected
When GF appears on a LG refrigerator, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LFXS26973S, LG LMXS28626S, 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 GF calls are resolved without parts: open household water supply fully and dispense 10 seconds to purge air. 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 GF 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
- Water supply valve closed or saddle valve pierced incompletely
- Clogged LG inline water filter restricting flow
- Kinked copper line behind the fridge
- Failed flow sensor or frozen fill line
Step-by-step fixes
- 1Open household water supply fully and dispense 10 seconds to purge air
- 2Replace water filter if overdue—LG recommends ~6 months
- 3Inspect the fill tube inside the freezer for ice plug
- 4Reset by unplugging two minutes after confirming strong water at the saddle valve
When to call a technician
Strong flow at the disconnect with persistent gF indicates flow sensor or dispenser valve service.
Affected models
- LG LFXS26973S
- LG LMXS28626S
- LG LRFXC2416S
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use refrigerators to prevent GF from lint and food debris buildup.
- Record when GF appears in the cycle and whether it clears after a 60-second power reset on your LG refrigerator—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for GF; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting GF; reversed plugs on pumps and valves cause immediate repeat faults.