54
Maintenance
Service Manual
6. Abnormal Sound and Vibration
Possible causes
Discriminating method (air conditioner status)
Troubleshooting
When turn on or turn off the unit,
the panel and other parts will
expand and there's abnormal
sound
There's the sound of "PAPA"
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
When turn on or turn off the unit,
there's abnormal sound due
to flow of refrigerant inside air
conditioner
Water-running sound can be heard
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
There’re foreign objects inside air
conditioner or parts are contacting
with each other
Abnomal sound
Take out foreign objects. Adjust the position of
parts. Stick damping plaster between contacting
parts.
Abnormal shake of compressor Outdoor unit gives out abnormal sound
Adjust the support foot mat of compressor,
tighten the bolts.
Abnormal sound inside the
compressor
Abnormal sound inside the compressor
If add too much refrigerant during maintenance,
please reduce refrigerant properly. Replace
compressor for other circumstances.
4. Compressor Can't Operate
Possible causes
Discriminating method (air conditioner status)
Troubleshooting
Wrong wire connection, or poor
connection
Check the wiring status according to circuit
diagram
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly
C a p a c i t y o f c o m p r e s s o r i s
damaged
Measure the capacity of fan capacitor with an
universal meter and find that the capacity is out of
the deviation range indicated on the nameplate of
fan capacitor.
Replace the compressor capacitor
Power voltage is a little low or
high
Use universal meter to measure the power supply
voltage. The voltage is a little high or low
Suggest to equip with voltage regulator
Coil of compressor is burnt out
Use universal meter to measure the resistance
between compressor terminals and it's 0
Repair or replace compressor
Cylinder of compressor is blocked Compressor can't operate
Repair or replace compressor
5. Unit hasn't stop operation afer bucket full or bucket full protection occurs frequently
Possible causes
Discriminating method (air conditioner status)
Troubleshooting
Water-level switch is open-
circuited
The unit hasn’t stop operation when water is full
and there’s water leakage
Check and repair the water-level switch
Draw water motor is damaged
Water over-flow protection occurs frequently and
H8 is displayed
Replace draw water motor
3. Fan Can't Swing
Possible Causes
Discriminating Method (Air conditioner Status)
Troubleshooting
Wrong wire connection, or poor
connection
Check the wiring status according to circuit
diagram
Connect wires according to wiring diagram to
make sure all wiring terminals are connected
firmly
Fan capacitor is damaged
Use universal meter to measure voltage at both
ends of fan capacitor
Replace fan capacitor
Supply voltage is too low or too
high
Use universal meter to measure the voltage
You are suggested to equip with voltage
regulator
Motor is damaged
Above circumstances are normal, while the fan
can’t operate
Repair or replace motor
