Troubleshooting
4-18 Samsung Electronics
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. → Check everything is
normal after replacing the PCB at the fault in the
Inverter PCB. → End the service.
Checking normal operation
Yes
Yes
Yes
Check the outdoor unit
Inverter PCB fan connector voltage
→ After power is on, check the voltage between connector pins.
1. Is the DC_Link voltage correct? (Normal: 264Vdc ≤ DC_Link voltage ≤ 374Vdc)
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)
※ At least 30 seconds after power is OFF, attach/detach the fan motor connector!
→ Threatened to cause secondary damage to the motor and the PCB.
※ Check the Inverter PCB or Fan Motor single parts and only if there is a fault, replace!
※ Do not replace the Main PCB of the outdoor unit relating to the fault in the Fan Motor!
→ If the error is indicated on 7-segment of the Main PCB of the outdoor unit, the Main PCB of the outdoor unit has no fault.
→ In case of a control problem, it is possible to solve with S/W update.
Check the connection of
the fan connectors (CN901, CN911).
1. Is the outdoor fan connector correctly connected?
2. Are the wires of the outdoor fan connector
correctly connected?
Check the single parts of Fan Motor.
(Be sure to turn off the power and check after30 seconds!)
1. Are the resistance values between pins of the fan motor
connector similar to those in the following table?
Make sure to check after power Off!
No
No
Connect the fan connectors (CN901, CN911) correctly.
→ Power on.
→ After checking normal operation, end the service.
11 33 44 55 66
#1-#3 DC_Link Voltage (between DC_link and GND) 264Vdc~374Vdc
#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
Motor Connector
11 33 44 55
66
#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)
4-2-13. Outdoor unit FAN error - (E458, E475)
Outdoor unit display
,
Judgment Method Refer to checking method, as shown below.
Cause of problem -
1.
Cause of problem
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