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TROUBLESHOOTING FOR NORMAL MALFUNCTION
1. Air conditioner can not start up
Possible Causes
Discriminating Method (Air Conditioner
Status)
Troubleshooting
No power supply or poor connection for power
plug
After energizer, operation indicator is not
bright and the buzzer can not 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 the outdoor unit, or poor connection for
wiring terminals.
Under normal power supply circumstances,
operation indicator is not bright after
energization
Check the circuit according to the circuit
diagram and connect wires correctly. Ensure
all wiring terminals are connected firmly.
Electric leakage from air conditioner
After energization, room circuit breaker trips
off at once.
Ensure the air conditioner is ground reliably.
Ensure wires of the air conditioner are
connected correctly. Check the wiring inside
the air conditioners. Check whether the
insulation layer of power cord is damaged; if
yes replace 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 batters 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 if its blocked Clean the filter
Installation position for the indoor and outdoor
units is improper
Check whether the installation position is
correct according to installation requirements
for air conditioner.
Adjust the installation position and install the
rainproof and sun proof for the 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 the leakage causes and repair them. 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's pressure
is much lower than regulated range. If
refrigerant is not leaking, part of capillary is
blocked.
Replace the capillary
Flow volume is insufficient
The pressure of valves is much lower than
that stated in the specification
Open the valve completely
Malfunction of horizontal louver Horizontal louver can not swing
Refer to point 3 of maintenance method for
details
Malfunction of the IDU fan motor The IDU fan motor can not operate
Refer to troubleshooting for H6 for
maintenance method in details
Malfunction of the ODU fan motor The ODU fan motor can not operate
Refer to point 4 of maintenance method for
details
Malfunction of compressor Compressor can not operate
Refer to point 5 of maintenance method for
details
3. Horizontal louver can not swing
Possible Causes
Discriminating Method (Air Conditioner
Status)
Troubleshooting
Wrong wire connection, or poor connection
Check the wiring status according to the
circuit diagram
Connect wires according to the wiring diagram
to ensure all wiring terminals are connected
firmly
Stepping motor is damaged Stepping motor cannot operate Repair or replace stepping motor
Main board is damaged
Others are all normal while horizontal lover
can not operate
Replace the main board with the same model
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