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6
6. TROUBLESHOOTING
WARNING
All the maintenance work listed below must be carried out with the power switched off, i.e.
with the plug removed.
PROBLEM
CAUSE
Execution
SOLUTION
Motor switches off
during operation
Overheating of the fan unit
U
U
AST
Possible overload (check
connections and hoses)
Ambient temperature too high
(room temperature may be a
max. of 40 °C)
Fan motor defective
Motor doesn’t run
No current to the unit
Switch not switched on
Turbine blocked
Air inlet or outlet blocked
Switch broken off
Wiring loose
U
U
U
U
AST
AST
Connect device; check fuse.
Turn on the switch
Eliminate the reason for the
blockage
Switch off the machine and
let it cool down; then check
the connections and hoses
Request a replacement switch
from the dealer or Preair
Check the wiring and tighten
if necessary
Motor runs but
impeller turns
irregularly or scrapes
Defective rotor or motor
AST
Remove the impeller from
the housing and then clean or
repair it
Unit vibrates
excessively
Accumulation of dirt on the impeller
U
Clean the impeller
