57
F27
-01
Indoor/outdoor unit
disconnection problem
Indoor/outdoor unit connection cable and
connection terminals, or indoor unit and outdoor
unit power supplies (outdoor side)
-05
Indoor/outdoor unit connection
error problem
Indoor/outdoor unit connection wire (outdoor
side)
F30
-01
System problem Total capacity for the number of indoor units is
insufficient, or over check the total capacity and
the number of indoor units
-02
Open phase, or reversed
phase of supply
Check the main power supply terminal board
connections, or switch over any two of the
power supply wires.
F31
-01
Suction pressure protection Insufficient refrigerant
-02
High-pressure cut-off Check the Refrigeration system
-06
4 way valve problem Check the 4 way valve or lead wire
-08
Freezing problem (Cooling
model)
Check the Refrigerant system
-09
Leakage Refrigerant problem Check the Refrigerant system
-10
Refrigerant system problem Insufficient refrigerant or valve operation
(closed)
F32
-03
Inverter protection (Low DC
voltage)
Check the Power supply
-04
Inverter protection (IPM
protection)
IPM fault or PCB (MAIN) fault
-05
Compressor overcurrent
protection
Open phase or lock in compressor
-06
Compressor discharge temp.
protection
Insufficient refrigerant
-08
Inverter protection (PFC
protection)
PFC fault (PCB-PFC fault)
-09
Inverter protection (DC current
protection)
IPM fault or lock in compressor
-10
Number of rotation Compressor
problem
IPM fault or lock in compressor
F35 -02
D. C Fan motor lock problem D.C Fan motor lock
F40
-01
Outlet temperature sensor
problem
Outlet temperature sensor lead wire, connector
CN-TH1
-11
Compressor suction
temperature sensor problem
Suction temperature sensor (SUC T. TEMP)
lead wire, connector CN-TH2 or valve operation
(closed)
-21
Heat exchanger outlet
temperature sensor problem
Heat exchanger outlet temperature sensor
(COND TEMP) lead wire, connector CN-TH1
-31
DEF temperature sensor
problem
DEF temperature sensor (PIPE TEMP) lead
wire, connector CN-TH2
-51
Compressor discharge
temperature sensor problem
Compressor discharge temperature sensor
(DIS T. TEMP) lead wire, connector CN-DIS
F41
-02
High pressure switch open
circuit problem
High-pressure switch lead wire, connector
CN-
PSW1
-11
Low pressure sensor problem Low-pressure sensor lead wire, connector
F42 -11
Current detector open circuit Outdoor unit P.C.B (NOISE FILTER) fault or
connector ACN2
F44 -01
Inverter protection (IPM temp.
sensor problem)
IPM fault or PCB (MAIN) fault
LED308 LED309 Unit No. (when twin or tripe)
• The LED301 (green) illuminates to indicate that the microprocessor on the
printed circuit board is operating normally.
If the LED is switched off is flashing irregularly. Check the power supply, and
turn it off and then back on again
Master unit problem
Slave unit problem
Wired remote control unit
display
Outdoor unit printed circuit board LED
Location of problem Check location
Abnormal
display
Detail
display
302 303 304 305 306 307 308 309
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