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Service Manual
9.3 Maintenance Method for Normal Malfunction
1. Air Conditioner Can't be Started Up
Possible Causes
No power supply, or poor
connection for power plug
Poor connection for wiring
terminals
Electric leakage for air conditioner
Model selection for air switch is
improper
Malfunction of remote controller
2.Poor Cooling for Air Conditioner
Possible Causes
Set temperature is improper
Rotation speed is set too low
Filter is blocked
Installation position for unit is
improper
Refrigerant is leaking
Malfunction of capillary
Malfunction of fan motor
Malfunction of compressor
3.Poor Heating for Electric Heater
Possible Causes
Electric heating relay on main
board is damaged
Connection needle stand between
main board and display board is
loose
Set temperature and ambient
temperature are almost the same
Installation and Maintenance
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
or Membrane
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
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 fan motor can't operate
Compressor can't operate
Discriminating Method (Air conditioner Status)
Even heating condition is satisfied, electric heater
can't be started up under heating mode
Even heating condition is satisfied, electric heater
can't be started up under heating mode
Poor heating effect
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.
1.Make sure the air conditioner is grounded
reliably.
2.Make sure wires of air conditioner is
connected correctly.
3.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
1.Replace batteries for remote controller.
2.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.
Find out the leakage causes and deal with it.
Add refrigerant.
Replace the capillary.
Refer to point 4 of maintenance method for
details.
Refer to point 5 of maintenance method for
details.
Troubleshooting
Replace the main board with the same model.
Insert the needle stand tightly.
Increase the set temperature.
35
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