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Troubleshooting
SiUS041501E
61
Service Diagnosis
4.2
Indoor Unit PCB Abnormality
Error Code
A1
Method of Error
Detection
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Error Decision
Conditions
The system cannot set the internal settings.
Supposed
Causes
Wrong models interconnected
Defective indoor unit PCB
Disconnection of connector
Reduction of power supply voltage
Troubleshooting
Note:
Check the following connector.
Check the connection of
connectors (See Note.).
Correct the connection.
OK?
Check the power supply
voltage.
Start operation.
Voltage as rated?
Error repeats?
Check the power supply
voltage.
Start operation.
Voltage as rated?
Error repeats?
Error repeats?
Combination of
the indoor and outdoor
unit matched?
YES
NO
NO
YES
NO
NO
YES
(R20486)
Caution
∗
To secure the connection,
once disconnect the connector
and then reconnect it.
YES
NO
YES
NO
YES
NO
YES
Match the compatible
models.
Correct the power
supply.
Replace the indoor unit
PCB (control PCB).
Completed.
Completed.
Correct the power
supply.
Replace the indoor unit
PCB (control PCB).
Completed.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Model Type
Connector
09/12 class
Terminal board ~ Control PCB (H1, H2, H3)
18/24 class
Terminal board ~ Filter PCB (S100)
Summary of Contents for FTKN09NMVJU
Page 12: ...SiUS041501E 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 59: ...SiUS041501E Remote Controller 48 Part 5 Remote Controller 1 Cooling Only 49 2 Heat Pump 51...
Page 65: ...SiUS041501E Service Diagnosis 54 5 13 Power Module Check 100...
Page 132: ...Revision History Month Year Version Revised contents 03 2015 SiUS041501E First edition...