Lescheider Weg 6-8 • D-53773 Hennef-Bierth • Tel. +49 2248 9173-0 • Fax -79 • www.kunststoff-mueller.de
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Fault
Possible causes
Remedial measures
Fan makes a
grinding noise
Foreign body between rotor and
housing
Remove foreign body.
Rotor deformed
Check rotor.
Advise Joh. Mueller Kunststoff GmbH.
Overcurrent
protection device
(motor protection
switch) turns the
fan off
Overcurrent protection device
(motor protection switch)
incorrectly set.
Adjust overcurrent protection device (motor
protection switch).
Motor overload
Check power connection/s.
Rotor blocked
Check rotor.
Motor defective
Advise Joh. Mueller Kunststoff GmbH.
Loss of
performance
Elastic sleeving torn, porous /
leaky
Check for wear and replace if needed.
Inlet and outlet piping leaky
Check piping.
Noisy when started
or operating
Motor stator winding incorrectly
wired
Check motor stator winding.
Winding or phase fault in motor
winding
Determine motor winding and insulation
resistance, maintenance required.
Advise Joh. Mueller Kunststoff GmbH.