Samsung Refrigerator Error Code R-g

R-g is a defrost error code indicating the refrigerator compartment defrost heater stayed on for 80 minutes without the cycle completing successfully. The code points to a problem in the defrost system, which includes the defrost heater, the thermal fuse, and the R-defrost sensor. The refrigerator's control board triggers this code as a protective measure to prevent overheating or further system damage. Diagnosing the fault requires testing each of those three components for continuity and correct resistance.

Continued use is not recommended without addressing the fault. If the defrost cycle is not completing, frost will accumulate on the evaporator coils over time and restrict airflow, causing the refrigerator to lose its ability to maintain safe food temperatures. Food spoilage is a real risk if the problem goes unresolved. The refrigerator should be inspected and repaired as soon as practical.

Repair costs vary depending on which component has failed. A replacement thermal fuse is typically the least expensive fix, with parts generally ranging from a few dollars to around $20. A defrost heater or R-defrost sensor will usually cost somewhere in the range of $20 to $80 for parts. If professional labor is involved, total repair costs including diagnosis and installation can range from $100 to $300 or more depending on your location and service rates.

A power reset may temporarily clear the R-g code from the display, but it will not fix the underlying defrost system failure. The error will return the next time the defrost cycle runs and fails to complete within 80 minutes. Resetting is useful for confirming whether the fault is intermittent, but the heater, thermal fuse, and R-defrost sensor should all be tested before assuming the issue is resolved.

Start by checking the three components directly involved in the defrost circuit: the refrigerator defrost heater, the thermal fuse, and the R-defrost sensor. Use a multimeter to test the heater and thermal fuse for continuity, and check the sensor's resistance at a known temperature to verify it is within the expected range. Replace any component that tests as open or out of specification. If all components test correctly, a control board fault may be responsible.