Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 200

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-2 Error Code [4106]
1. Error code definition
<Transmission power supply fault Error detail code FF (Outdoor unit)>
2. Error definition and error detection method
Transmission power output failure
3. Cause
1) Wiring failure
2) Transmission power supply cannot output voltage because overcurrent was detected.
3) Voltage cannot be output due to transmission power supply problem.
4) Transmission voltage detection circuit failure
4. Check method and remedy
Check the transmission power supply circuit on all outdoor units in a given refrigerant circuit for problems. [8-11-2 Trouble-
shooting Problems with Outdoor Unit Transmission Power Supply Circuit]
7-6-3 Error Code [4109]
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
(1) Auxiliary relay fault
(2) Connector (CN28) is disconnected.
(3) Blown fuse
(4) Motor error (thermistor error inside the motor)
BS_07_M
Cause Check method and remedy
The coil or the wiring of the auxiliary relay connected to
CN28 is faulty.
Check the connector for proper connection.
Check the fuse on the control circuit board.
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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