Indoor Unit Pcb Abnormality - Daikin FTX20K(2)V1B Service Manual

SiBE041525F
4.2

Indoor Unit PCB Abnormality

A1
Error Code
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Method of Error
Detection
The system cannot set the internal settings.
Error Decision
Conditions
 Wrong models interconnected
Supposed
 Defective indoor unit PCB
Causes
 Disconnection of connector
 Reduction of power supply voltage
Troubleshooting
Check the following connector.
Note:
20/25/35 class
50/60/71 class
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 (See Note.).
OK?
NO
Correct the connection.
Error repeats?
NO
Model Type
Terminal board ~ Control PCB (H1, H2, H3)
Terminal board ~ Filter PCB (S100)
NO
∗ To secure the connection,
once disconnect the connector
and then reconnect it.
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
Connector
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.
(R20486)
50