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Maintenance
Service Manual
9.3 Maintenance Method for Common Malfunction
1. Air Conditioner Can't 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
hasn’t been inserted tightly and
poorly connected; wires hasn’t
been connected well.
Operation indicator is OFF and buzzer won’t give
out sound.
Check whether there’s 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 can’t be started up after pressing ON/OFF
button.
Check wire connection of temperature sensor or
replace temperature sensor.
Electric leakage for air conditioner
After 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-ow protection).
Discharge condensate water.
Malfunction of water-level switch
Check water-level switch and connection (refer
to detection ow 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 lter to see whether it’s blocked by
sundries
Clean the lter.
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;
Unit's pressure is much lower than regulated
range
Find out the leakage causes and deal with it.
Add refrigerant.
Evaporator is frosted
Has set COOL (DRY) mode, but there’s no cool
fan
The system is defrosting. Resume operation
after defrosting is nished.
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;
Unit't pressure is much lower than regulated
range. If refrigerant isn’t leaking, part of capillary
is blocked
Replace the capillary.
Malfunction of fan Fan can’t operate
Refer to point 3 for detailed maintenance
method.
Malfunction of compressor Compressor can't operate
Refer to point 4 of maintenance method for
details.
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