LG Refrigerator Error Code E 25

E 25 on an LG RSG5B-series refrigerator indicates a fridge compartment defrost error caused by overheating during the defrost cycle. The control board detected that temperatures in the defrost circuit exceeded safe limits and shut down the defrost operation. This code points to a fault in the defrost heater, thermal limiter, wiring harness, defrost thermostat, or main PCB relay. A resistance check at connector CN70 on the main board is the recommended starting point for diagnosis.

The refrigerator has suspended the defrost cycle to prevent further overheating, which means frost may continue to accumulate on the evaporator coils over time. Continued use without repair can lead to reduced cooling performance as the coils become blocked with ice. There is no immediate fire or electrical hazard to the home in most cases, but leaving the fault unaddressed will eventually cause the fridge compartment to warm and food spoilage. Repair should be prioritized promptly.

Repair costs vary depending on which component has failed. Replacing a blown thermal limiter or defrost heater element typically involves parts costs in the range of $20 to $80, plus labor if a technician performs the repair. If the main PCB defrost relay or the entire board requires replacement, costs can range from $150 to $400 or more depending on the part and service fees in your area. Getting a firm diagnosis before ordering parts helps avoid unnecessary expense.

The initial diagnostic step, disconnecting CN70 and measuring resistance between the Orange and White wires, is within reach for a knowledgeable DIYer with a multimeter. A reading of 0 ohms points to a shorted heater element, while infinite resistance indicates an open circuit from a blown thermal limiter or cut wire. Replacing the heater or thermal limiter involves accessing the evaporator compartment and working near refrigerant lines, so comfort with appliance disassembly is required. If the fault traces to the main PCB, professional repair is recommended.

A power reset may temporarily clear the E 25 code from the display, but it will not fix the underlying defrost circuit fault. The code will return once the control board attempts another defrost cycle and detects the same overheating or circuit fault condition. Resetting without repairing can actually allow the problem to worsen as frost accumulates. A proper component-level diagnosis and repair are necessary to permanently resolve the error.