4-6-4 Outdoor Detailed Inspection Procedure
No Procedure Inspection Method Cause
1 T
urn OFF the power
and check wire and
socket connection on
each part
Wait until C702-C707 discharged
1) Is connection of housing to socket normal?
2) Is connection of each wire to terminal block normal?
3) Is the reactor wire connection normal?
4) Is there no miss-wiring of each cable?
• installation mistake
• m
iss assembling
2 F
USE check Is the fuses on each PCB normal?
3 fuese on EMI PCB
1 fuse on MAIN PCB
1 fuse on INVERTER PCB
• wire short
• o
verload
• B
LDC FAN short error
3 T
urn on the power
and check voltage of
terminal block
Is N-R,N-S,N-T around 230Vac?
Is R-S,S-T,T-R around 400Vac?
Is L-N(to indoor unit) around 230Vac?
Is F1-F2 within 5Vdc?
• miss wiring of power cable
• w
ire detaching
4 C
heck LED display on
AIN PCB
1) Is RED LED ON?
2) Is GREEN LED Blinking once a second?
3) Is LEDs displaying error code pattern?
• MAIN PCB power trouble
•
bad communication between indoor and
outdoor unit
• e
rror detection
5 C
heck LED display on
INVERTER PCB
1) Is RED LED ON?
2) Is GREEN LED Blinking once a second?
3) Is LEDs displaying error code pattern?
• INVERTER PCB power trouble
•
NO communication between MAIN and
INVERTER PCB
• e
rror detection
6 C
heck DC voltage of
SMPS output
MAIN PCB
1) Is voltage of CN51 pin#1-#2 12-14.5V?
2) Is voltage of C108 5V?
INVERTER PCB
3) Is voltage of CN51 pin#1-#2 5V?
4) Is voltage of C124 12V?
5) Is voltage of each ZD100,ZD101,ZD102,ZD103 17-18V?
• S
MPS circuit trouble
7 C
heck INVERTER PCB 1) Is resistance of R100 200ohm?
1) To check this, touch one probe to CN10 pin#1(N) and
t
he other to D101 upper side pin of '~' marking pins
2) Is DC Link voltage 450-510V?
1) Check IGBT module pins marking voltage near C701
• r
esister
•
wire connection between EMI PCB and
INVERTER PCB
8 C
heck BLDC fan 1) See 12-2-3 The Outdoor unit Fan error(Fault Diagnosis)
4-34
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