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SiUS121827E Troubleshooting for SA Indoor Unit
Part 6 Service Diagnosis 185
6.4 Indoor Fan PCB Abnormality
Applicable
Models
FDMQ09/12/15/18/24RVJU
Error Code A8
Method of Error
Detection
Microcomputer checks the voltage state of the fan PCB.
Error Decision
Conditions
Overvoltage or voltage drop is detected on the fan PCB.
Supposed
Causes
Defective fan PCB
External factor such as noise
Troubleshooting
R6000549
Caution
Be sure to turn off the power switch before connecting
or disconnecting connectors, or parts may be damaged.
Check for the indoor unit control
PCB (A1P) and the fan PCB
(A2P).
Connect the connector correctly.
NO
YES
YES
Is the
connector X3A on
the fan PCB connected
correctly?
Connect the connector correctly.
NO
YES
Is the
connector X70A on
the indoor unit control PCB
connected correctly?
Replace the harness.
YES
Is the harness
connecting X3A and X70A
broken?
NO
NO
Remove the external factor.
YES
Is there any external
factor such as noise?
Normal.
NO
Error is displayed
again.
Turn OFF the power supply
and then turn it ON again.
Start operation with the
remote controller.
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