Samsung AS24A2RC Service Manual page 11

3-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is input voltage normal?(rating voltage ±10% range)
(2) Is the set temperature of the remote control higher than room temperature in COOL mode?
(3) Is the POWER IN connector (CN78) linked correctly?
(4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?
2) Troubleshooting procedure
After unplugging out the power cord should be recon-
nected within five seconds.
Does the operating lamp blink
Does the timer lamp blink during operation ?
Is the power relay RY71 operated by adjusting the room
temperature?
Test rod location
+ -
IC06 Pin #6 GND
Is the rating Voltage ±10% range applied relay between CN78
10
NO
YES
YES
NO
YES
Normal
Condition Voltage
RY71 ON DC 4.8V
NO
and .
YES
Is the room sensor normal register?
50˚F
17.96k Ω
Check as in the procedure "No Power parts"
PCB and
Room tem-
Room temperature sensor is
perature
sensorshould
be checked.
PCB is out of order.
NO
Power relay is
out of order
NO
(25°C 10KΩ)
68˚F 86˚F
12.09k Ω 8.3k Ω
YES
Refer to page 8.
out of order
Refer to replace
PCB module
Power relay should be
replaced.
Outdoor unit is
out of order.