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12 .20 Troubleshooting:
Problem
The fan motors do not rotate
The model vibrates
The noise level of model is
too high
34
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Possible causes
Interruption of the electric power line
(conductors, disconnecting switches, regulators,
pressure switches, etc)
Intervention of
thermal protection
of fan motors
Burning of motor windings
Inadequate fixing of the model
Loosened fan motor fastening screws
Unbalanced fan motors
Obstructed finned pack
Unbalanced fan motors
Worn-out fan motor bearings
Suction air temperature
of fan motors beyond
allowed limits
Obstruction of the
finned pack
Fan motor blades
blocked by foreign
objects
Possible solutions
Check electric power line up to fan
motor junction and reset
Check project figures and
data especially the working
temperatures
Clean finned pack and carry out
maintenance more frequently
Remove obstacles
Replace burnt motors
Adequately fasten model
Restore correct fastening
Replace unbalanced fan motors
Clean finned pack or carry out
maintenance more frequently
Replace unbalanced fan motors
Replace noisy fan motors
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