7 Diagnostics / Faults
7.1 Trouble shooting
Type of error
Possible cause
Remedial measures
Fan does not
run (anymore)
Mains voltage failure
Failure of a phase
Under - or overvoltage
Check mains voltage
Earth fault
Check the motor connection and mains voltage
Coil closure
Replace fan
thermal motor protection has
triggered (motor is over-
heated)
check for free air passages; remove foreign bodies if nec-
essary
See
“
Impeller blocked or dirty
”
Check supply air temperature
Check voltage
Impeller blocked or dirty
- Disconnect the motor from the power supply and secure it
against switching back on
- Check safe isolation from supply
- Remove protective grille
- Remove foreign bodies or dirt
- Reinstall protective grille
- proceed as described in the Commissioning chapter
Fan does not
start
Temperature too low for
bearing grease
Insert bearing with cold greasing
Air stream wrong direction
(Motor turns in wrong direc-
tion at high speed)
Check air stream
(see behaviour in rotation by air current in reverse direc-
tion)
see
“
Fan does not run
”
“
Fan turns too
slowly
”
Impeller / blade drags /
scrapes
When indicated clear foreign bodies / dirt from the fan
Active temperature manage-
ment e
ff
ective
(Motor or electronics over-
heated)
check for free air passages; remove foreign bodies if nec-
essary
See
“
Impeller blocked or dirty
”
Check supply air temperature
Check installation space (air speed over heat sink)
air
fl
ow too low
“
Fan turns too slowly
”
see "Fan turns too slowly"
Airways blocked
Check for free air passages (supply/exhaust air
fl
aps,
fi
l-
ters)
See
“
Impeller blocked or dirty
”
Pressure loss di
ff
erent to
projection
Check fan selection
Vibrations
Imbalance
Check blades for damage, soiling or ice (see "Impeller
blocked or dirty")
No or wrong vibration damp-
ers (only in radial)
Install correct vibration dampers
Assembly instructions
ECblue
Diagnostics / Faults
L-BAL-F056-GB 2022/45 Index 005
Part.-No. 00700562-GB
32/44