7-1
7. Troubleshooting
7.1 Troubleshooting
The cause of the failure and the corrective measures against it may be different even if the fan
exhibits the same symptom. In addition, there may be two or more causes.
If you cannot find the cause or corrective measures in the following table, immediately stop the
operation and contact the vendor or the service center specified by the manufacturer.
Symptom of failure
Cause of failure
Ins
uf
fic
ie
nt f
low ra
te
Motor
does
n
ot r
u
n
E
xce
ssi
ve
n
o
is
e
E
xce
ssi
ve
vi
br
at
io
n
Motor
ov
er
lo
ad
Remedy
Improper duct piping
9
9
9
Inspect and repair the duct piping
Excessive duct resistance
9
9
9
Review the duct piping
Insufficient duct resistance
9
Review the duct piping
Insufficient rotation speed
9
Check the power voltage
Reverse rotation
9
Swap two of the power wires of the
motor
Contact of rotor with
stationary part
9
9
9
9
Disassemble and repair
Contamination with foreign
matter
9
9
9
9
Disassemble and conduct internal
inspection
Faulty bearing
(damaged/worn out)
9
9
9
Replace the motor
Improper installation
9
9
Check the installation
Failure related to power
supply
9
9
Inspect and repair
Failure of the motor
9
9
9
Replace the motor
Caution
If you need to change any parts or repair the pump, ask the vendor or
the service center specified by the manufacturer.
Improper work may lead to malfunctions or accidents.
