Indoor Unit Pcb Abnormality - Daikin FTKM-U Series Service Manual

SiMX042215E
4.2

Indoor Unit PCB Abnormality

A1
Error Code
Method of Error
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Detection
Error Decision The system cannot set the internal settings.
Conditions
Supposed
 Wrong models interconnected
Causes  Defective indoor unit PCB
 Disconnection of connector
 Reduction of power supply voltage
Troubleshooting
Note
 Wire harness (Connector): Terminal strip ~ Control PCB (H1, H2, H3)
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Combination of
the indoor and outdoor
unit matched?
YES
Check the connection of
connectors/wire harness. ★
OK?
NO
Correct the connection.
Error repeats?
NO
NO
To secure the connection,
disconnect the connectors once
and then reconnect.
YES
Check the power supply
voltage.
Voltage as rated?
YES
Start operation.
Error repeats?
NO
YES
Check the power supply
voltage.
Voltage as rated?
YES
Start operation.
Error repeats?
NO
Troubleshooting
Match the compatible
models.
NO
Correct the power
supply.
YES
Replace the indoor unit
PCB (control PCB).
Completed.
NO
Correct the power
supply.
YES
Replace the indoor unit
PCB (control PCB).
Completed.
Completed.
R6000615
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