Troubleshooting
Samsung Electronics
22
Test rod location
+
Condition
-
IC04 Pin No.38
RY71 ON
GND
DC 4.8V
Normal
Voltage
5-3-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)
1. Checklist :
1) Is input voltage normal?
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 (CN71) linked correctly?
5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(N(1), 1, 2, 3)?
2. Troubleshooting procedure
Yes
Yes
No
Yes
Yes
Yes
No
After unplugging out the power cord should be
reconnected within 5 seconds.
Does the timer lamp blink during operation?
No
Check as in the procedure
"No Power parts"
No
#
@
#
!
PCB should be checked.
Is the power relay RY71 operated by adjusting
the room temperature?
Does the OPERATION lamp blink
Micom is
out of order.
PCB should be checked.
Room temperature sensor is
out of order
Power relay should be
replaced.
10°C
20°C
12.09k
Ω
17.96k
Ω
8.3k
Ω
30°C
Is the room sensor normal register?
Is rating voltage ±10% range applied relay between
Terminal block No. N(1) and No. 1
Power relay is
out of order
Outdoor unit is out of order.
!
@
No
DB98_16569A(2)_1 4/6/04 2:57 PM Page 22
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