Samsung AS12A2VC Service Manual page 12

3-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is input voltage normal?(the rating voltage ±10% range)
(2) Is the set temperature of the remote control higher than room temperature in COOL mode?
(3) Is the set temperature of the remote control lower than room temperature in HEAT mode?
(4) Is the POWER IN connector (terminal-tab) linked correctly?
(5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?
2) Troubleshooting procedure
After unplugging out the power cord should be
reconnected 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
+ -
IC1 Pin No.63 GND
Is the rating voltage ±10% range applied relay between
Terminal Tap(TB71) and RY 71 terminal No. 3
YES
NO
NO 1
Normal
Condition Voltage
RY73 ON DC 4.8V
NO
YES
1 NO
Is the room sensor normal register?
10°C
17.96k Ω
NO
Check as in the procedure "No Power parts"
YES
Room temperature sensor is
out of order
2
Microcomputer is
out of order.
YES 3
Power relay is
out of order
Outdoor unit is
2 NO
20°C 30°C
12.09k Ω 8.3k Ω
YES 3
Refer to page 5-2.
PCB should be checked.
PCB should be
checked.
Power relay should be
replaced.
out of order.
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