12 Troubleshooting Guide
12.1. Self-diagnosis error code table
•
• •
•
The display screen on the wired remote control unit and the self-diagnosis LEDs (green) on the outdoor unit printed circuit board
in the outdoor unit can be used to indicate where the location of a problem is.
Refer to the table below to remove the cause of the problem, and then re-start the air conditioner system.
•
• •
•
If the problem disappears and operation returns to normal, the CHECK display on the remote control unit will switch off, but the
self-diagnosis LED will remain illuminated until operation is resumed.
... illuminated ... flashing Blank off.
Wired remote
control unit display
Outdoor unit printed circuit board LED Location or problem Check location
Abnormal
dispaly
Detail
dispaly
302 303 304 305 306 307 308 309
F15 -01 Drain level Float switch problem Drain pump and drain pipe, indoor unit
connectors CN-DRMTR&CN-TH2
F16 -01 Louver switch problem Louver motor, decorative panel connection
terminal, or indoor unit louver motor
connectors
F17 -02 D. C Fan Motor problem Indoor unit D. C Fan motor or connection
terminals
F20 -01 Indoor temperature sensor
problem
Indoor temperature sensor lead wire or
indoor unit connector or CN-TH2
-02 Remote control thermistor
problem
Remote control thermistor
F21 -01 Pipe temp. sensor problem
(indoor unit)
Pipe temperature sensor lead wire or indoor
unit connector CN-TH1
F26 -01 Remote control transmission
problem
Remote control unit cable and connection
terminals
F27 -01 Indoor/outdoor unit
disconnection problem
Indoor/outdoor unit connection cable and
connection terminals, or indoor unit and
outdoor unit power supplies (indoor side)
-05 Indoor/outdoor unit connection
problem
Indoor/outdoor unit connection wire (indoor
side)
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
vollage)
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
85
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5
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