Samsung AS18A9RCF Service Manual page 18

2. When the Indoor Unit Fan Does Not Operate - Initial Diagnosis
2. When the Indoor Unit Fan Does Not Operate - Initial Diagnosis
1) Checklist :
(1) Is the indoor unit fan motor properly connected with the connector (CN73)?
(2) Is the AC voltage correct?
(3) Is HALL IC in the indoor fan motor properly connected with the connector (CN43)?
(4) Is the running capacitor properly connected with PCB board?
2) Troubleshooting procedure
After unplugging out, the power cord should
be reconnected within five seconds.
YES
Does the STD lamp(Orange) blink?
YES
Does the Solid State Relay(SS71) work
properly?
Test rod location
+ -
SS71- SS71-
YES
Is the supply voltage of the fan
motor sufficient?
Test rod location
PCB CN73 Condition
pin #3 and #5 Fan operate
YES
NO
NO
Normal
Voltage
12V
NO
Normal
voltage
about AC
180V
Fan motor
is abnormal.
Check as the procedure "No power"
Refer to page"16"
Micom is abnormal
Replace the PCB
PCB is
abnormal
Refer to page21
MFC is abnormal
Replace Fan motor
module
Replace MFC
17