50
Installation and Maintenance
Service Manual
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 lter to see its blocked Clean the lter
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; Units
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; Unitt
pressure is much lower than regulated range. If
refrigerant isnt leaking, part of capillary is blocked
Replace the capillary
Flow volume of valve is insufcient
The pressure of valves is much lower than that
stated in the specication
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
9.3 Troubleshooting for Normal Malfunction
1. Air Conditioner Can't be Started Up
2. Poor Cooling (Heating) for Air Conditioner
3. Horizontal Louver Can't Swing
Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting
No power supply, or poor connection
for power plug
After energization, operation indicator isnt bright
and the buzzer Can't give out sound
Conrm whether its 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 isnt bright after energization
Check the circuit according to circuit diagram
and connect wires correctly. Make sure all wiring
terminals are connected rmly
Electric leakage for air conditioner
After energization, room circuit breaker trips off at
once
Make sure the air conditioner is grounded reliably
Make 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
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 rmly
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
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