Maintenance
Service Manual
6. Abnormal sounds and vibration
Possible causes
Discriminating method
Troubleshooting
There is abnormal sound in some
parts when just turning on or
turning off the unit
+ ~~
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
There is abnormal sound of
turning on or turning off the unit
Water-running sound can be heard
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
There is touching sound of foreign
objects or parts inside the unit
The unit gives out abnormal sound
Ta k e o u t t h e f o r e i g n o b j e c t s ; a d j u s t t h e
position of each part inside the unit; tighten the
connection screws; apply some damping gum
on the touching 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.
5. Water leakage
Possible causes
Discriminating method
Troubleshooting
Drainage pipe hasn’t been
installed correctly.
Water is coming out from indoors.
Eliminate the blocking objects inside the
drainage channel.
Possible causes
Discriminating method
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
Compressor relay on the
mainboard is broken or the
compressor needle stand is
loosened
Check if the relay is sucked in cooling mode
Replace the mainboard with the same model
Capacity of compressor is
damaged
After tuning on the unit, the unit can’t dehumidify.
Use universal meter to measure the resistance
value of two contact points of capacitor. If the
resistance value is too big or o, the capacitor is
damaged.
Replace the compressor
Power voltage is a little low or
high
After turning on the unit, dehumidifying effect is
poor or compressor is turned on or off frequently.
Use universal meter to measure the power supply
voltage directly
The fluctuation of voltage is 10% rated power.
If the power is too low or too high, you are
suggested to equip wit voltage regulator.
Coil of compressor is burnt out
There is no dehumidifying effect after turning on
the unit; test the resistance of the wiring poles of
compressor with universal meter; if the resistance
&
Repair or replace compressor
Cylinder of compressor is blocked
The dehumidifying effect is poor after turning on
the unit; the noise of compressor is big and the
compressor is hot
Repair or replace compressor
4. Compressor can't operate
