Mitsubishi Air Conditioner Error Code E.OPT

E.OPT indicates an option fault, meaning the drive has detected a problem with an installed or expected plug-in option card, an external converter connection, or a parameter configuration conflict. The fault covers three main scenarios: incorrect AC wiring to an FR-HC2 or FR-CV converter, a missing option card required for torque command mode, or a communication option card with an active Pr.296 password lock. A technician needs to identify which of these three conditions applies before attempting a repair.

The E.OPT fault will typically prevent the drive from operating normally, so continued operation is not possible until the fault is resolved. Attempting to force operation while an option card is missing or incorrectly configured could lead to improper motor control or system instability. Power down the unit and perform diagnostics before attempting to restart.

A simple power cycle or reset will not permanently clear the E.OPT fault if the underlying cause has not been corrected. The error will return as soon as the drive re-checks its option configuration on startup. You must resolve the root cause, whether that is fixing the wiring, installing the correct option card, or clearing the Pr.296 password lock, before the fault will stay cleared.

Start by checking all AC power supply connections to any connected converter units such as the FR-HC2 or FR-CV, making sure the wiring is correct and properly phased. Next, inspect the option card slots inside the drive to confirm the required plug-in board is present and fully seated. Finally, access the Pr.296 parameter to check whether a password lock is active on a communication option and clear it if necessary. If the fault persists after addressing these areas, the option card itself may need replacement.

If the issue is a wiring error or a password lock setting, the repair cost is primarily labor, typically ranging from $75 to $200 depending on the technician and location. If a plug-in option card needs to be purchased and installed, parts costs can add $100 to $400 or more depending on the specific card required. Getting an accurate quote requires identifying which of the three underlying causes applies to your system.