User Manual

15
TROUBLESHOOTING
TROUBLESHOOTING
MALFUNCTION CODES
Display
Code
Malfunction
Name
Symptoms Possible Causes
F1 Ambient
Temperature
Sensor
Malfunction
Compressor and
fan motor have
stopped. The
buttons on the
control panel do
not work.
• Ambient temperature sensor
is loose or is poorly connected
to the display board terminal.
• An element of the display
board may have been installed
upside down and short-
circuited.
• Ambient temperature sensor is
damaged.
• Display board is damaged.
F2 Tube
Temperature
Sensor
Malfunction
• Temperature sensor on the
evaporator is loose or poorly
connected to the display
board terminal.
• An element of the display
board may have been installed
upside down and short-
circuited.
• Temperature sensor on the
evaporator is damaged.
• Display board is damaged.
F5 Discharge
Temperature
Sensor
Malfunction
• Temperature sensor on the
evaporator is loose or poorly
connected to the display
board terminal.
• An element of the display
board may have been installed
upside down and short-
circuited.
• Display board is damaged.
L1 Humidity Sensor
Malfunction
• Humidity sensor is short-
circuited.
• Humidity sensor is damaged.
• Display board is damaged.
F0 Freon-Lacking
Protection
The compressor
stops and the
fan motor
stops after 30
seconds.
• Refrigerant is leaking.
• Unit is blocked.
H3 High-
Temperature
Overload
Protection
• Ambient operating conditions
are poor.
• Evaporator and condenser are
blocked by dirt/dust.
E4 High discharge
temperature
The compressor
stops and the
fan motor
stops after 30
seconds.
• Device has encountered an
abnormal condition (blockage,
etc.)
• Motor rotation speed is
abnormal.
• Air intake is obstructed.
• Compressor discharge
temperature sensor is
damaged or poorly connected.