7 Diagnostic
7.1 Trouble shooting
Type of error Possible cause Adjustment
Fan does not run
(anymore)
No line voltage
line failure
Under - or overvoltage
Check line voltage
Earth fault Check motor connection and line voltage
Short circuit winding Replace fan
Thermal motor protection has trig-
gered (motor is overheated)
Check for free air passages; remove foreign bodies if necessary
"Impeller blocked or dirty"
Check temperature of supply air
Check voltage
Impeller blocked or dirty - Switch off power to the motor and secure against switching back on
- Check safe isolation from supply
- Remove safety grille
- Remove foreign bodies or soiling
- Remount the safety grille
- Further procedure as in the chapter “Start-up”
Fan will not start Temperature too low for bearing
grease
Insert bearing with cold greasing
Air stream wrong direction
(Motor turns in wrong direction at
high speed)
Check air stream
"Fan does not run"
Fan turns too slowly Impeller / blade scrapes / brushes When indicated, clear foreign bodies/dirt from the fan
Air flow to low Fan turns too slowly
"Fan turns too slowly"
Airways blocked Check for free air passages (supply/exhaust air vents, filters)
"Impeller blocked or dirty"
Pressure loss different to planned Check fan selection
Vibrations Imbalance Check blades for damage, soiling or ice
"Impeller blocked or dirty"
No or wrong vibration dampers
(only in radial)
Install correct vibration dampers
Unusual noises Bearing damaged / worn Change bearings
(for motor size “Z” replace fan)
Impeller / blade scrapes / brushes When indicated clear foreign bodies / dirt from the fan
"Impeller
blocked or dirty"
Operation beyond stall point
(for axial fans)
Check for free air passages (supply/exhaust air vents, filters)
Wrong overlap on nozzle
(for centrifugal fans)
Observe the installation instructions
Assembly instructions ECblue Diagnostic
L-BAL-F065-GB 1617 Index 004 Part.-No. 00702801-GB
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