LG Oven Error Code C-31

C-31 on an LG oven means the temperature sensor located on the main PCB (control board) has shorted while the oven is running. This is an internal board-level sensor, not the oven cavity temperature probe. The fault prevents the oven from operating safely until the condition is resolved, and the fix requires replacing the main PCB.

No, you should not use the oven while C-31 is active. The error indicates the control board's temperature monitoring circuit has shorted, meaning the board cannot reliably manage its own thermal condition. Continued operation risks further damage to the control board or other oven components.

The primary cost is the main PCB replacement part, which typically ranges from $150 to $350 depending on the specific LG model. If you hire a technician, labor costs can add another $100 to $200 to the total. Comparing the repair cost to the age and value of the oven is worth considering before proceeding.

The prescribed repair is to disconnect power, remove the back cover, and replace the main PCB. A technician comfortable with appliance disassembly and component replacement can complete this repair. However, working near high-voltage components carries risk, so if you are unsure, hiring a qualified technician is the safer choice.

A power reset may temporarily clear the fault code from the display, but C-31 will return once the oven is operated again because the underlying short in the PCB temperature sensor circuit has not been repaired. The only lasting fix is replacing the main PCB.