LG Refrigerator Error Code E 21

E 21 on an LG RSG5B* series refrigerator indicates a freezer evaporator fan error. The main PCB has detected a problem with the fan motor circuit responsible for circulating cold air through the freezer compartment. This can be caused by a failed motor, ice obstruction, wiring damage, or a fault in the main PCB output. The freezer will struggle to maintain proper temperatures while this error is active.

Unplugging the refrigerator for a few minutes may temporarily clear the display, but E 21 will return if the underlying fault is still present. A reset is useful for ruling out a one-time glitch, but if the error reappears after power is restored, the fan motor, wiring, or PCB requires further diagnosis and likely repair.

Repair costs depend on the root cause. A replacement freezer fan motor typically ranges from $30 to $80 for the part, with labor adding $80 to $150 if a technician is hired. If the main PCB is faulty, part costs alone can range from $100 to $300 or more depending on availability. A service call to diagnose the exact cause is often worthwhile before purchasing parts.

Some causes of E 21 are DIY-friendly. You can start by unplugging the refrigerator, removing any ice buildup around the freezer fan, and checking that the fan connector is securely seated. If the fan blade spins freely by hand and connections are intact, diagnosing whether the fault is in the fan motor or the main PCB requires a multimeter to measure voltage at CN74, which is more suited to a technician.

Continuing to run the refrigerator with an active E 21 error is not recommended. Without a functioning freezer fan, cold air cannot circulate properly, and freezer temperatures will rise. This puts frozen food at risk of spoilage and can cause other components, such as the compressor, to work harder than intended. Address the fault as soon as possible.