SiUS091601EA
5. Troubleshooting for FTX, FVXS Series
5.1
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
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. ★
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 for FTX, FVXS Series
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.
(R23407)
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