Mitsubishi Air Conditioner Error Codes
Mitsubishi 4109 Error Code
1. Error code definition
Indoor unit fan operation error
2. Error definition and error detection method
1) Connector CN28 has remained open-circuited for 100 consecutive secondsduring operation.
3. Cause, check method and remedy
Cause Check method and remedy
(1) Auxiliary relay fault The coil or the wiring of the auxiliary relay connected to
CN28 is faulty.
(2) Connector (CN28) is disconnected. Check the connector for proper connection.
(3) Blown fuse Check the fuse on the control circuit board.
(4) Motor error (thermistor error inside the motor) Check the unit fan for proper operation in the test run
mode.
If no problems are found with items 1 through 3 above and
the fan does not operate, replace the motor
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