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Troubleshooting
Troubleshooting
9.3 Troubleshooting for Normal Malfunction
1. Air Conditioner Can't be Started Up
Possible Causes
Discriminating Method (Air conditioner Status)
Troubleshooting
No power supply, or poor
connection for power plug
After energization, operation indicator isn’t bright
and the buzzer can't give out sound
Confirm whether it's due to power failure. If
yes,wait for power recovery. If not, check power
supply circuit and make sure the power plug is
connected well.
Wrong wire connection
between indoor unit and
outdoor unit, or poor
connection for wiring
terminals
Under normal power supply circumstances,
operation indicator isn't bright after energization
Check the circuit according to circuit diagram
and connect wires correctly. Make sure all wiring
terminals are connected firm
Electric leakage for air
conditioner
After energization, room circuit breaker trips off
at once
Make sure the air conditioner is grounded
reliablyMake sure wires of air conditioner is
connected correctly.
Check the wiring inside air conditioner. Check
whether the insulation layer of power cord is
damaged; if yes, place the power cord
Model selection for air switch
is improper
After energization, air switch trips off
Select proper air switch
Malfunction of remote
controller
After energization, operation indicator is bright,
while no display on remote controller or buttons
have no action
Replace batteries for remote controller
Repair or replace remote controller
2. Poor Cooling (Heating) for Air Conditioner
Possible Causes
Discriminating Method (Air conditioner Status)
Troubleshooting
Set temperature is improper Observe the set temperature on remote controller
Adjust the set temperature
Rotation speed of the IDU fan
motor is set too low
Small wind blow
Set the fan speed at high or medium
Filter of indoor unit is blocked Check the filter to see it's blocke
Clean the filt
Installation position for indoor
unit and outdoor unit is
improper
Check whether the installation postion is proper
according to installation requirement for air conditioner
Adjust the installation position, and install
the rainproof and sunproof for outdoor
unit
Refrigerant is leaking
Discharged air temperature during cooling is higher
than normal discharged wind temperature; Discharged
air temperature during heating is lower than normal
discharged wind temperature; Unit's pressure is much
lower than regulated range
Find out the leakage causes and deal
with it. Add refrigerant.
Malfunction of 4-way valve
Blow cold wind during heating
Replace the 4-way valve
Malfunction of capillary
Discharged air temperature during cooling is higher
than normal discharged wind temperature; Discharged
air temperature during heating is lower than normal
discharged wind temperature; Unit't pressure is much
lower than regulated range. If refrigerant isn’t leaking,
part of capillary is blocked
Replace the capillary
Flow volume of valve is
insufficien
The pressure of valves is much lower than that stated
in the specificati
Open the valve completely
Malfunction of horizontal
louver
Horizontal louver can’t swing
Refer to point 3 of maintenance method
for details
Malfunction of the IDU fan
motor
The IDU fan motor can’t operate
Refer to troubleshooting for H6 for
maintenance method in details
Malfunction of the ODU fan
motor
The ODU fan motor can't operate
Refer to point 4 of maintenance method
for details
Malfunction of compressor
Compressor can't operate
Refer to point 5 of maintenance method
for details
3. Horizontal Louver Can't Swing
Possible Causes
Discriminating Method (Air conditioner Status)
Troubleshooting
Wrong wire connection, or
poor connection
Check the wiring status according to circuit
diagram
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firm
Stepping motor is damaged Stepping motor can't operate
Repair or replace stepping motor
Main board is damaged
Others are all normal, while horizontal louver can't
operate
Replace the main board with the same model
Diagram 1
3
(9) PFC protection(U9)
Main checking points:
●
●
If the power supply is normal;
Check if the connection wire of induction is connected well and if the induction is broken;
Flow chart:
Start
Check If the power supply is normal
Power supply is abnormal
yes
yes
yes
no
no
no
Check if the outdoor induction is broken
The induction is broken
Replace the induction
Replace the outdoor
mainboard
Malfunction is eliminated
End
Turn on the unit after the
power supply resumes to
normal situation
