When The Outdoor Unit Does Not Operate. (Initial Diagnosis) - Samsung SH09ZW8X Service Manual

Troubleshooting

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
After unplugging out the power cord should be
reconnected within 5 seconds.
Does the OPERATION 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 No.38
Is rating voltage ±10% range applied relay between
Terminal block No. N(1) and No. 1
18
Yes
No
#
Normal
Voltage
- Condition
GND RY71 ON DC 4.8V
Yes
Yes
!
Yes
Is the room sensor normal register?
10°C
17.96kΩ
No
Yes
!
No
Micom is
out of order.
No Power relay is
out of order
No
@
20°C 30°C
12.09kΩ 8.3kΩ
#
Check as in the procedure
"No Power parts"
Room temperature sensor is
out of order
PCB should be checked.
@
PCB should be checked.
Power relay should be
Outdoor unit is out of order.
Samsung Electronics
replaced.