45
Maintenance
Service Manual
9. Maintenance
9.1 Error Code
NO. Malfunction
Name
Display Method of Indoor Unit
A/C Status
Possible Causes
Error
Code
Indicator lamp
(During blinking, ON for 0.5S and
OFF for 0.5 S)
Operation
Inidicato
COOL
Indicator
HEAT
Indicator
1
Indoor
ambient
temperature
sensor is
open/short-
circuited
F1
OFF 3S
and blinks
once
Compressor and
draw water motor
stop operation. Fan
operates at set fan
speed.
1. The wiring terminal between indoor
ambient temperature sensor and main
board is loosened or poorly contacted.
2. There’s short circuit due to trip-over of
the parts on main board.
3.Indoor ambient temperature sensor is
damaged (Please check it by referring to the
resistance table for temperature sensor).
4. Main board is damaged.
2
Indoor
evaporator
temperature
sensor is
open/short-
circuited
F2
OFF 3S
and blinks
twice
Compressor and
draw water motor
stop operation. Fan
operates at set fan
speed.
1. The wiring terminal between indoor
evaporator temperature sensor and main
board is loosened or poorly contacted.
2. There’s short circuit due to the trip-over
of the parts on main board.
3.Indoor evaporator temperature sensor is
damaged (Please check it by referring to the
resistance table for temperature sensor).
4. Main board is damaged.
3
Outdoor
condenser
temperature
sensor is
open/short-
circuited
F4
OFF 3S
and blinks
4 times
Compressor and
draw water motor
stop operation. Fan
operates at set fan
speed.
1. The wiring terminal between outdoor
condenser temperature sensor and main
board is loosened or poorly contacted.
2. There’s short circuit due to the trip-over of
the parts on main board.
3. Outdoor condenser temperature sensor is
damaged (Please check it by referring to the
resistance table for temperature sensor).
4. Main board is damaged.
4
Overcurrent
protection
E5
OFF 3S
and blinks
5 times
During cooling and
drying operation,
indoor fan operates,
while other loads
stop operation.
1. Unstable supply voltage. Normal fluctuation
shall be within 10% of the rated voltage on the
nameplate.
2. Supply voltage is too low and load is too
high.
3. Measure the current of live wire on main
board. If the current isn’t higher than the
overcurrent protection value, please check the
controller.
4. Whether heat exchangers are too dirty, or
the air inlet and air outlet are blocked.
5. Whether the fan motor operates normally,
fan speed is too low or the fan doesn’t run.
6. Whether compressor operates normally.
There is abnormal sound, oil leakage or the
temperature of the shell is too high, etc.
7. There’s blockage in the system (filth
blockage, ice plug, greasy blockage, Y-valve
hasn’t been opened completely).
