LG Microwave Error Code E-83

E-83 indicates a PCB communication error between the main control board and the sub PCB in your LG microwave. The two boards have lost the ability to exchange data signals, which causes the unit to stop operating. This fault is most often traced to the wiring harness or connectors linking the two boards, though the boards themselves can also be at fault.

No, you should not attempt to use the microwave while E-83 is active. The error means the control boards cannot communicate properly, and the unit will not operate normally in this state. Attempting to force operation could lead to unpredictable behavior. Unplug the appliance and have it inspected before use.

Repair costs depend on the root cause. If only a harness connector needs reseating or a damaged harness needs replacement, costs are generally lower, typically in the range of $50 to $150 for parts and labor. If the sub PCB or main PCB requires replacement, parts alone can range from $80 to $250 or more depending on the model, with additional labor costs on top. In some cases, replacement of the appliance may be more economical than board-level repairs.

A knowledgeable DIYer can start by unplugging the microwave and carefully inspecting the main harness and display connector for loose, corroded, or damaged connections. Reseating connectors firmly may resolve the error if a loose connection is the cause. However, if the harness or a control board needs replacement, working inside a microwave carries high-voltage risks even when unplugged due to the capacitor, so professional service is strongly recommended.

Unplugging the microwave for a minute and restoring power may temporarily clear the code if the communication failure was caused by a transient glitch. However, if the underlying cause is a loose connector, damaged harness, or faulty board, the E-83 error will return. A reset alone is not a fix and the wiring should still be inspected.