53
Maintenance
Service Manual
10. Maintenance
10.1 Error Code
NO. Malfunction
Name
Display
Method of
Indoor Unit
A/C Status
Possible Causes
Error Code
1
Indoor
ambient
temperature
sensor is
open/short-
circuited
F1
Compressor and motor stop
operation. When the fan operates
for 2mins, the complete unit will
be turned off;
1. The wiring terminal between indoor ambient temperature
sensor and main board is loosened or poorly contacted.
2. Theres 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
Compressor and motor stop
operation. When the fan operates
for 2mins, the complete unit will
be turned off;
1. The wiring terminal between indoor evaporator
temperature sensor and main board is loosened or poorly
contacted.
2. Theres 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
Compressor and motor stop
operation. When the fan operates
for 2mins, the complete unit will be
turned off;
1. The wiring terminal between outdoor condenser
temperature sensor and main board is loosened or poorly
contacted.
2. Theres 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
Insufficient
fluorine
protection
F0
The compressor stops operation.
The indoor fan operates at set
fan speed, and the outdoor fan
operates at low fan speed. Buttons
are invalid.
Please contact the after-sales person to deal with it.
5
Water
over-flow
protection
H8
Compressor and motor stop
operation. When the fan operates
for 2mins, the complete unit will be
turned off;
During cooling or drying operation,condensate water will flow
into chassis. If its detected that water inside water chassis
is full for 3s successively, it comes into water over-flow
protection. Buzzer will give out 8 sounds and dual-8 nixie tube
displays error code “H8”.
6
Overload
protection for
compressor
H3
The compressor stops operation.
Indoor fan operate at current fan
speed and the outdoor fan operates
at low fan speed;
1. Heat exchangers are too dirty or the air inlet/outlet is
blocked.
2. The fan operates abnormally; fan speed is too low or the
fan doesnt run.
3. Compressor doesnt work normally. Strange noise or
leakage occurs. Temperature of the shell is too high.
4. System is blocked inside(dirt block, ice block, oil block,
Y-valve not fully open).
5. Draw-water motor cant operate normally.
6. Water outlet hasnt been blocked well by rubber cork .
7. The refrigerant is leaking and cause overheating protection
to compressor.
