59
Maintenance
Service Manual
10.3 Maintenance Method for Common Malfunction
1. Air Conditioner Cant be Started Up
2. Poor Cooling (Heating) for Air Conditioner
Possible Causes for Malfunction
Distinguish Method (A/C status)
Maintenance Method
No power supply; power plug
hasnt been inserted tightly and
poorly connected; wires hasnt
been connected well.
Operation indicator is OFF and buzzer wont give
out sound.
Check whether theres power supply;
Check power plug and wire connection.
Ambient temperature sensor is
damaged (no connection, loosen,
wires are damaged, resistance
value for temperature sensor is
abnormal).
After energization, the unit will give out a sound,
while it cant be started up after pressing ON/OFF
button.
Check wire connection of temperature sensor or
replace temperature sensor.
Electric leakage for air conditionerAfter 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.
Water inside water chassis is full Dual8 nixie tube displays H8 and buzzer gives
out 8 sounds (water over-flow protection).
Discharge condensate water.
Malfunction of water-level switch
Check water-level switch and connection (refer
to detection flow chart 3).
Possible Causes
Discriminating Method (Air conditioner Status)
Troubleshooting
Set temperature is improper
Observe the set temperature on remote controller Adjust the set temperature.
Fan speed is set too slow
Small fan blow at air outlet
Set the fan speed at high or medium.
Filter unit is blocked
Check the filter to see whether its blocked by
sundries
Clean the filter.
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
Please contact the after-sales service person.
Evaporator is frosted
Has set COOL (DRY) mode, but theres no cool
fan
The system is defrosting. Resume operation
after defrosting is finished.
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.
Malfunction of fan
Fan cant operate
Refer to point 3 for detailed maintenance
method.
Malfunction of compressor
Compressor cant operate
Refer to point 4 of maintenance method for
details.
