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