Indoor Fan Pcb Abnormality - Daikin 4MXS-R Series Service Manual

Troubleshooting for SA Indoor Unit
6.4

Indoor Fan PCB Abnormality

Applicable
FDMQ09/12/15/18/24RVJU
Models
A8
Error Code
Method of Error
Microcomputer checks the voltage state of the fan PCB.
Detection
Error Decision
Overvoltage or voltage drop is detected on the fan PCB.
Conditions
Supposed
Causes
Troubleshooting
169
Defective fan PCB
External factor such as noise
Be sure to turn off the power switch before connecting
Caution or disconnecting connectors, or parts may be damaged.
Is the
connector X70A on
the indoor unit control PCB
connected correctly?
YES
Is the
connector X3A on
the fan PCB connected
correctly?
YES
Is the harness
connecting X3A and X70A
broken?
NO
Is there any external
factor such as noise?
NO
Turn OFF the power supply
and then turn it ON again.
↓
Start operation with the
remote controller.
Error is displayed
again.
YES
NO
NO
YES
YES
NO
SiUS121736EA
Connect the connector correctly.
Connect the connector correctly.
Replace the harness.
Remove the external factor.
Normal.
Check for the indoor unit control
PCB (A1P) and the fan PCB
(A2P).
(R25085)
Service Diagnosis