Troubleshooting For Normal Malfunction; Air Conditioner Can't Be Started Up; Poor Cooling (Heating) For Air Conditioner; Horizontal Louver Can't Swing - Gree GWH18QD-K3DNA1G Service Manual

9.3 Troubleshooting for Normal Malfunction

1. Air Conditioner Can't 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 The IDU fan motor can't operate
Malfunction of the ODU fan motor The ODU fan motor can't operate
Malfunction of compressor

3. Horizontal Louver Can't Swing

Possible Causes
Wrong wire connection, or poor
connection
Stepping motor is damaged
Main board is damaged
64
Discriminating Method (Air conditioner Status)
After energization, operation indicator isn't bright
and the buzzer can't give out sound
Under normal power supply circumstances,
operation indicator isn't 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 Adjust the set temperature
Small wind blow
Check the filter to see it's 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;
Unit's 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;
Unit't pressure is much lower than regulated
range. If refrigerant isn't leaking, part of capillary
is blocked
The pressure of valves is much lower than that
stated in the specification
Horizontal louver can't swing
Compressor can't operate
Discriminating Method (Air conditioner Status)
Check the wiring status according to circuit
diagram
Stepping motor can't operate
Others are all normal, while horizontal louver
can't operate
Troubleshooting
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.
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
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
Service Manual
Installation and Maintenance