20
FU-40SE-TA
TROUBLESHOOTING GUIDE
Always use the specified parts as shown page 26, 27 when replacing them.
Service of the PWB ass'y
The electrical circuit is composed of the Display PWB, Switch PWB ass'y, Relay PWB ass'y and the Power supply
PWB ass'y.
No.
1
2
3
4
5
6
7
Trouble
Not displayed.
(Power supply lamp)
Malfunction of the keys
(You cannot activate the
keys.)
The fan motor does not
rotate.
The silent lamp is flashing.
Noise is heard.
The unit cannot be
operated on the remote
control.
Dust collection
performance is bad.
The temperature fuse is blown.
Improper wiring.
It is unusually heavy when fan motor is
turned by hand.
(The motor is defective and current fuse
broken.)
Disconnection of current fuse on a power
PWB.
(Those with the possibility with poor Motor.)
The fan feels extremely heavy when you
rotate it manually.(The motor is broken
and the PWB current fuse is blown.)
The PWB is defective.
The power supply cord is broken.
The PWB is defective.
The PWB is defective.
Improper wiring.
The motor is defective.
The motor is defective.
The fan motor does not rotate.
The motor harness is not inserted to the
motor properly.
The motor harness is not inserted to the
PWB properly.
The motor is defective.
The motor is not installed properly.
The shape of the fan is not suitable.
The fan is not installed properly.
The unit is used near the inverted lighting.
The lighting equipment is old and blinking.
The unit is used in direct sunlight.
The remote control is defective.
The PWB is defective.
The batterys are not mounted on the
remote control.
The batterys of the remote control is dead.
The replacement time of filter had passed.
The pre-filter is clogged.
There is an obstacle near the exhaust and
suction openings.
The unit is not assembled properly.
The key remains pressed down.
Check the connector insertion,
or repair or replace the connector.
Replace the motor and the PWB.
Check the motor. (Fan motor is
turned by hand as mentioned above,
and it is replace the motor and
PWB of Motor when heavy).
Replace the motor and the PWB.
Replace it.
Replace it.
Replace it.
Repair or replace it.
Repair.
Replace it.
The check of connector insertion,
repair, replace.
Replace the motor.
Replace it.
Check the insertion.
Check the insertion.
Replace it.
Repair.
Replace it.
Repair or replace it.
The fan is not installed properly.
Repair or replace it.
A cluster has the sound of " tick ", " tick ",
" tick ". This is sound that is emitted when the
unit is generating cluster ions.
And this is not a trouble.
If the sound is irritating, such as
when sleeping, etc., set the cluster
ion mode to OFF.
Change the installation position.
Replace the lighting equipment.
Change the installation position.
Replace it.
Replace it.
Mount the batterys.
Replace it.
Replace the batterys.
Clean it.
Change the installation position.
Replace the temperature fuse ass'y
and the defective parts (motor).
Possible cause and symptom
Solution
