9
No cooling
No operation
Is there indicator on
LCD?
Check power supply
and power cord
No
Check
transformer
Replace
display board
Replace main
board
Check wiring
Check room
temperature setting
Is the Water Full
lamp flashing?
Yes
Can the fan motor
operate?
Check wiring.
Yes
Check water
tank
Check water
depth controller
switch
Replace
display board
Replace main
board
No
No
Check fan motor
capacitor.
Is the voltage of
CN11 on main board
correct?
Replace main
board.
Yes
No
Replace fan
motor.
Yes
Check Whether the
evaporator or
condenser is
blocked.
Check compressor
capacitor.
Check temperature
sensor.
Is the voltage of
RL4 on main board
correct?
Replace compressor
Yes
No
Replace main board
No heating
Is there indicator on
LCD?
No
Can the fan motor
operate?
Check wiring.
Yes
No
Check over temp
protector on heater.
Is the voltage of
RL2 and RL3 on
main board correct?
Replace main
board.
Yes
No
Replace heater
Yes
Check compressor
over-current
protector