Troubleshooting
4-32 Samsung Electronics
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1. Test Item
1) Check the connection of fan connectors (CN90, CN91). [In case of RC072DHXB6, CN901]
2) Check the voltage of the fan motor connector in the inverter PBA of the outdoor unit.
3) Check the power supply of the inverter PBA of the outdoor unit.
4) Check the single fan motor. (Do not forget to separate the motor connector 30 seconds after power off!)
2. Check procedure
Yes
Yes
Connect the fan corrector (CN90, CN91 or CN901)
correctly. ױ Power is on. ױ After confirming the
state is normal, end the service.
Check the power supply of the inverter PBA of the outdoor unit.
1. Check by referring to When the outdoor unit power is not ON –
Initial Diagnosis.ױ Check everything is normal after replacing
the PBA at the fault in the inverter PBA.ױ 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 external fan
connector correctly connected?
Check the voltage
of the fan connector to
the inverter PBA of the outdoor unit.
ױ 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 command voltage
≤ 5Vdc)
Check after power OFF!
After power is on, check everything is normal.
ױ End the service.
Connect the connections of
the outdoor unit which has
two outdoor fans.
Connect the connections of
the outdoor unit which has
one outdoor fan.
#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 and GND)
2Vdc ~ 5Vdc
Measuring Part Diagnosing Part Value of good product
#5(YEL)-#3(BLK) resistance
(between fan control and GND)
Open (infinite resistance)
#4(WHT)-#3(BLK) resistance
(between DC15V and GND)
Approx. 1.0k ~ 3k
#5(YEL)-#3(BLK) resistance
(between fan control and GND)
Approx. 230k ~ 280k
#6(BLU)-#3(BLK) resistance
(between feedback and GND)
some M or more or open
(infinite resistance value)
Motor Connector
Yes
Check the single fan motor.
(30 seconds after power is off,
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! ױ Threatened to cause secondary damage to the motor and the PBA.
ఐ Check the single inverter PBA or fan motor and only if there is a fault, replace!
ఐ Do not replace the main PBA of the outdoor unit relating to the fault in the fan motor!
ఐ If the error is indicated on 7-segment of the main PBA of the outdoor unit, the main PBA of the outdoor unit has no fault.
ఐ In case of a control problem, it is possible to solve with S/W update.
[RC090/100/125/140/14566666
AC666FCA666]
[RC072DHXB6]
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