Service manual

SiBE05-722_C Troubleshooting
Service Diagnosis 61
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 combination of the
indoor and outdoor unit.
OK?
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?
YES
NO
NO
YES
NO
NO
YES
(R15310)
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.
Completed.
Completed.
Correct the power
supply.
Replace the indoor unit
PCB.
Completed.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Model Type Connector
Floor / ceiling suspended dual type S36 ~ S37