Troubleshooting
4-34 Samsung Electronics
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1. Test items
1) Check the connection of Fan connectors (CN90, CN91)
2) Check the voltage of the fan motor connector in the inverter PBA of the outdoor unit.
3) Chec
k the power connection of the outdoor unit Inverter PCB.
4) Check the Fan Motor single parts. (Be sure to turn off the power and separate the motor connect
or after 30 seconds!)
2. Check procedure
No
No
Yes
Yes
Connect the fan connectors (CN90, CN91 or CN901) correctly. ĺ
Power on. ĺ After checking normal operation, end the service.
Check the power connection of the Inverter PCB of the outdoor unit.
1. Check by referring to When the outdoor unit power is not ON -
Initial Diagnosis. ĺ Check everything is normal
after replacing the
PCB at the fault in the Inverter PCB. ĺ End the service.
Check the connection
of the fan connectors (CN90, CN91 or CN901).
1. Is the outdoor fan connector correctly connected?
2. Are the wires of the outdoor fan
connector
correctly connected?
Check the
outdoor unit Inverter PCB fan
connector voltage ĺ After power is
on, check the voltage between connector pins.
1. Is the DC_Link voltage correct? (Normal: 280Vdc ≤
DC
_Link voltage ≤ 360Vdc)
2. Is the fan control voltage correct? (Normal: 14Vdc ≤
FAN control voltage ≤ 16Vdc)
3. Is the fan command voltage?
(Normal: 2Vdc ≤FAN
c
ommand voltage
≤ 5Vdc)
Make sure to check after power Off!
checking normal operation
#1-#3 DC_Link Voltage (between DC_link and GND) 280Vdc ~ 360Vdc
#4-#3 DC_Link voltage (between DC15V and GND) 14Vdc ~ 16Vdc
#5-#3 FAN command voltage
(between fan control an
d GND)
2Vdc ~ 5Vdc
No
Measuring Part Diagnosing Part Value of good product
Motor Connector
#5(YEL)-#3(BLK) resistance
(between fan control and
GND)
Open (infinite resistance)
#4(WHT)-#3(BLK) resistance
(between DC15V and GND)
Approx. 1.0kΩ ~ 3kΩ
#5(YEL)-#3(BLK) resistance
(between fan control and
GND)
Approx. 230kΩ ~ 280kΩ
#6(BLU)-#3(BLK) resistance
(between feedback and
GND)
some MΩ or more or open
(infinite resistance value)
Yes
Check the
single parts of Fan Motor.
(Be sure to turn off the power and check after
30 seconds!)
1. Are the resistance values between pins of the fan
motor
connector similar to those in the
following table?
ఐ At least 30 seconds after power is OFF, attach/detach the fan motor connector! ĺ Threatened to ca
use secondary damage to the motor and the PCB.
ఐ Check the Inverter PCB or Fan Motor single parts and only if there is a fault, replace!
ఐ Do not
replace the Main PCB of the outdoor unit relating to the fault in the Fan Motor!
ĺ If the error is indicated on 7-segment of the Main PCB of the o
utdoor unit, the Main PCB of the outdoor unit has no fault.
ĺ In case of a control problem, it is possible to solve with S/W update.
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