Samsung Refrigerator Error Code 31

Error code 31 on a Samsung refrigerator signals a convertible zone fan error. The convertible compartment relies on a dedicated fan to circulate air, and this code appears when the control board detects that the fan is not operating as expected. Diagnosis begins by checking the supply voltage at MAIN PCB connector CN74 pins 1 and 5, which should measure between 7V and 12V.

With error code 31 active, the convertible zone compartment is not receiving proper airflow and will not maintain its set temperature reliably. Food stored in that compartment could be at risk of spoiling or freezing unintentionally depending on the mode selected. It is advisable to move sensitive items out of the convertible compartment until the fault is resolved.

A power reset may temporarily clear error code 31 from the display, but if the underlying fault with the convertible zone fan or its circuit is still present, the code will return once the control board re-runs its diagnostics. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for proper electrical testing and component inspection.

Some causes of error code 31 are accessible to a capable DIYer, such as reseating a loose connector at CN74, clearing ice buildup from around the fan blade, or replacing a damaged wiring harness. However, replacing the fan motor or the main control board requires comfort with appliance electrical work and basic test equipment like a multimeter. If you are not confident measuring voltages safely inside the unit, a qualified technician is recommended.

Repair costs vary depending on the root cause. A replacement convertible zone fan motor typically runs in the range of $30 to $80 for the part alone, while a main control board can cost $100 to $300 or more. Adding professional labor, total repair costs generally range from $100 to $400 depending on the failed component and your location.