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9. How to Service
9-10. Fan Noise
or vibration when working ?
Remarks
• The fan is sending out cold air to circulate it through the compartments. When the air is touching the surface of
louver or liner wall, such sound can make.
To avoid risk of electrical shock that can cause death or severe personal injury,
WARNING
!
disconnect unit from power before servicing unless tests require power.
Start
Fan is damaged
or transformed ?
N
Fan is touching
the surround ?
N
Fan-motor assembly
is moving or shaking ?
N
Motor has its own noise
N
Explain to the customers
how fan is working to
circulate cold air in the
compartments.
Y
Y
Y
Y
Change the fan.
Set it right not to touch.
Set it right not to move.
Change the motor
assembly.
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