Samsung AQ24A1QE Service Manual page 31

Troubleshooting
5-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)
1 ) Checklist :
(1) Is input voltage normal?(198-264VA C )
(2) Is the set temperature of the remote control higher than room temperature in COOL m o d e ?
(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 corre c t l y ?
(5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?
2 ) Troubleshooting pro c e d u re
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
+ -
IC04 Pin #59 GND
Is AC 198 - 264V applied relay between Terminal Tap(TB71) and RY
71 terminal No. 3
5-4
NO
YES
YES
NO
NO 1
Normal
Condition Voltage
RY71 ON DC 4.8V
NO
YES
1 NO
Is the room sensor normal register?
10°C
17.96k Ω
Check as in the procedure "No Power parts"
Room temperature sensor is
out of order
2
Microcomputer is
out of order.
YES 3
Power relay is
out of order
Outdoor unit is
out of order.
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.
Samsung Electronics