Samsung AS18A9RCF Service Manual page 19

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Troubleshooting (cont'd)
3. When the Outdoor Unit Does Not Operate - Initial Diagnosis
3. When the Outdoor Unit Does Not Operate - Initial Diagnosis
1) Checklist :
(1) Is input voltage normal? (voltage rating within ±10% range)
(2) Is the set temperature of the remote control higher than room temperature in the Cool mode?
(3) Is the POWER IN connector (CN78) linked correctly?
(4) Is the outdoor unit properly connected with the terminal black connector(5P)?
2) Troubleshooting procedure
After unplugging out, the power cord
should be reconnected within five seconds.
Does the timer lamp blink during operation ?
Is the power relay RY71 operated by adjusting
+
IC06 Pin #6
Is voltage rating within ±10% range applied relay
18
Does the STD lamp blink?
YES
NO
the room temperature?
Test rod location
- Condition
RY71 ON DC 4.8V
GND
NO
between CN 78 1 and 3 ?
YES
Is the room sensor registered normal?
50°F(10°C)
17.96k Ω
NO
Check PCB
YES
and room
temperature
sensor
1
1
YES
3
Normal
Voltage
NO
Power relay
is abnormal.
1
NO
2
68°F(20°C) 86°F(30°C)
12.09k Ω 8.3k Ω
YES
3
Check as the procedure "No Power"
Refer to page 16
Room temperature sensor is
abnormal.
Check PCB
2
PCB is abnormal.
Replace the PCB module
Refer to page 21
Replace the
Power relay
Outdoor unit is
abnormal.