Indoor Unit Pcb Abnormality - Daikin FTX20JV1B Service Manual

SiBE041010EA
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
Causes
Troubleshooting
Note: Check the following connector.
Wall Mounted Type
Service Diagnosis
Wrong models interconnected
Defective indoor unit PCB
Disconnection of connector
Reduction of power supply voltage
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the combination of the
indoor and outdoor unit.
OK?
YES
Check the connection of
connectors (See Note).
OK?
NO
Correct the connection.
Error repeats?
NO
Model Type
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
Terminal board ~ Control PCB (H1, H2, H3)
Troubleshooting
Match the compatible
models.
NO
Correct the power
supply.
YES
Replace the indoor unit
PCB.
Completed.
NO
Correct the power
supply.
YES
Replace the indoor unit
PCB.
Completed.
Completed.
(R15310)
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