Error Code [4106]; Error Code [4109]; Error Code [4121] - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[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. [8-10-2 Trouble-
shooting Problems with Outdoor Unit Transmission Power Supply Circuit]
1. Error code definition
<Transmission power supply fault other than error detail code FF (Outdoor unit)>
2.Error definition and error detection method
Transmission power reception failure
3.Cause
One of the outdoor units stopped supplying power, but no other outdoor units start supplying power.
4.Check method and remedy
Check the transmission power supply circuit on all outdoor units in a given refrigerant circuit for problems. [8-10-2 Trouble-
shooting Problems with Outdoor Unit Transmission Power Supply Circuit]
7-6-3

Error Code [4109]

1. Error code definition
Indoor unit fan fault
2. Error definition and error detection method
If the auxiliary relay X4 (for fan fault detection) remains unexcited for a certain period of time, the unit will come to an abnormal
stop, and the fan output goes off.
Overcurrent breaker trigger value
Model name, motor output
P250 model, 3.7kW
PFD
P500 model, 5.5kW
3. Cause, check method and remedy
(1) Overcurrent breaker (51F) is tripped.
(2) Blown fuse (F1)
(3) Auxiliary relay (X4) fault
(4) Broken wire
(5) Loose connector
(6) Indoor unit control board (I.B1, I.B2) fault
14
- chapter 7
Preset value
7.5A
12A
Cause Check method and remedy
Check the fan for proper rotation, check for worn bear-
ings, and check the pulley for proper alignment.
Check for proper belt tension (esp. overtension).
Check the motor for proper operation.
51F malfunction (Test switch is left to ON.)
Check for a loose or blown fuse
Loose, broken, or incorrect lead wire wiring
Coil fault, contact failure
Check for broken wire.
Check the connector for proper connection.
If no problems are found with the items above and if the
problem persists, circuit board failure is suspected.
BS_07_C