Mitsubishi Air Conditioner Error Code E.OC2

E.OC2 indicates an overcurrent trip that occurred while the compressor was running at constant speed. The output current from the inverter to the compressor reached or exceeded approximately 235% of the rated current, triggering the protection circuit. The system shuts down automatically to prevent damage to the inverter and compressor. A technician should inspect for wiring shorts, refrigerant system abnormalities, and drive parameter settings.

No. The unit has shut down its compressor specifically to avoid damage from extreme overcurrent conditions. Attempting to force the system to run without resolving the underlying cause risks damaging the inverter board, compressor windings, or output wiring, which can turn a moderate repair into a much more costly one. The system should remain off until the fault is diagnosed and cleared.

Repair costs vary widely depending on the cause. If the fault is a parameter correction or a wiring repair, costs are typically in the range of a standard service call fee. Refrigerant system repairs, such as correcting charge level or replacing a reversing valve, can range from moderate to high depending on the scope. Compressor or inverter board replacement represents the higher end of the cost spectrum, potentially ranging from several hundred to over a thousand dollars including labor and parts.

Some contributing factors, such as verifying that nothing is obstructing airflow or that the unit has not been physically disturbed, can be checked without tools. However, diagnosing a wiring short, verifying refrigerant pressures, and adjusting inverter parameter settings all require proper tools, refrigerant handling certification, and technical knowledge. A qualified HVAC technician should handle the full diagnosis and repair.

A power reset may temporarily clear the fault display and allow the unit to restart, but if the underlying cause has not been corrected, the E.OC2 fault will return, often very quickly once constant-speed operation resumes. Repeated resets without addressing the root cause can accelerate wear on the inverter and compressor. A proper repair should be completed before returning the unit to service.