Troubleshooting For Normal Malfunction - Gree GWH09ACC-K6DNA1F/I Service Manual

9.3 Troubleshooting for Normal Malfunction

1. Air Conditioner Cant be Started Up
Possible Causes
No power supply, or poor connection
for power plug
Wrong wire connection between
indoor unit and outdoor unit, or poor
connection for wiring terminals
Electric leakage for air conditioner
Model selection for air switch is
improper
Malfunction of remote controller
2. Poor Cooling (Heating) for Air Conditioner
Possible Causes
Set temperature is improper
Rotation speed of the IDU fan
motor is set too low
Filter of indoor unit is blocked
Installation position for indoor unit
and outdoor unit is improper
Refrigerant is leaking
Malfunction of 4-way valve
Malfunction of capillary
Flow volume of valve is insufficient
Malfunction of horizontal louver
Malfunction of the IDU fan motor
Malfunction of the ODU fan motor The ODU fan motor cant operate
Malfunction of compressor
3. Horizontal Louver Cant Swing
Possible Causes
Wrong wire connection, or poor
connection
Stepping motor is damaged
Main board is damaged
72
Discriminating Method (Air conditioner Status)
After energization, operation indicator isnt bright
and the buzzer cant give out sound
Under normal power supply circumstances,
operation indicator isnt bright after energization
After energization, room circuit breaker trips off at
once
After energization, air switch trips off
After energization, operation indicator is bright,
while no display on remote controller or buttons
have no action.
Discriminating Method (Air conditioner Status)
Observe the set temperature on remote controller
Small wind blow
Check the filter to see its blocked
Check whether the installation postion is proper
according to installation requirement for air
conditioner
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
Blow cold wind during heating
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
The pressure of valves is much lower than that
stated in the specification
Horizontal louver cant swing
The IDU fan motor cant operate
Compressor cant operate
Discriminating Method (Air conditioner Status)
Check the wiring status according to circuit
diagram
Stepping motor cant operate
Others are all normal, while horizontal louver cant
operate
Troubleshooting
Confirm 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.
Check the circuit according to circuit diagram
and connect wires correctly. Make sure all wiring
terminals are connected firmly
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.
Select proper air switch
Replace batteries for remote controller
Repair or replace remote controller
Troubleshooting
Adjust the set temperature
Set the fan speed at high or medium
Clean the filter
Adjust the installation position, and install the
rainproof and sunproof for outdoor unit
Find out the leakage causes and deal with it. Add
refrigerant.
Replace the 4-way valve
Replace the capillary
Open the valve completely
Refer to point 3 of maintenance method for details
Refer to troubleshooting for H6 for maintenance
method in details
Refer to point 4 of maintenance method for details
Refer to point 5 of maintenance method for details
Troubleshooting
Connect wires according to wiring diagram to make
sure all wiring terminals are connected firmly
Repair or replace stepping motor
Replace the main board with the same model
Installation and Maintenance