LG Refrigerator Error Code Er FF (or Er dH) - Freezer Fan / Defrost Heater Error

Medium Severity

Er FF indicates the Freezer Evaporator Fan motor is blocked or frozen by ice buildup; Er dH indicates the Defrost Heater failed to melt frost within 1 hour.

Appliance: LG Electronics Refrigerators & Freezers

Estimated Time: 45-60 minutes

Tools Required: Phillips screwdriver, hair dryer, turkey baster, warm water

⚠ Common Symptoms & Observations

Fresh food section warms up to 50°F+ (10°C); freezer coils caked in thick frost; strange whirring or grinding noise from the freezer back wall.

🔍 Root Causes for Code Er FF / Er dH

Defrost drain hole frozen over with ice
faulty defrost bi-metal thermostat
failed defrost heater
fan motor blade blocked by ice.

🔧 Step-by-Step DIY Troubleshooting & Fix Guide

Unplug the refrigerator and remove all food from the freezer into coolers.

Remove freezer drawers, shelves, and the plastic back wall panel (held by 4-6 Phillips screws).

If the evaporator coils are solid white with ice, use a hair dryer or steam cleaner on low heat to melt all frost completely.

Pour hot water mixed with baking soda down the small drain trough hole at the bottom of the coils until it drains freely into the drip pan beneath the fridge.

🔄 Master Reset Procedure for LG Electronics

Unplug the unit for 15 minutes, reconnect power, and allow 24 hours for temperatures to stabilize at 37°F (fridge) and 0°F (freezer).

Technician Tip: If the error code reappears immediately after a hard reset, the control board has detected an active electrical open circuit or failed component that requires physical inspection.