6 Diagnostics / Faults
6.1 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
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
Air stream wrong direction
(Motor turns in wrong direc-
tion at high speed)
Check air stream
see
“
Fan does not run
”
“
Fan turns too
slowly
”
Impeller / blade drags /
scrapes
When indicated clear foreign bodies / dirt from the fan
Check for free air passages; remove foreign bodies if nec-
essary
See
“
Impeller blocked or dirty
”
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")
unusual noises
Impeller / blade drags /
scrapes
When indicated clear foreign bodies / dirt from the fan (see
"Impeller blocked or dirty")
Operation beyond tear-o
ff
point
Check for free air passages (supply/exhaust air
fl
aps,
fi
l-
ters)
Assembly instructions
FE2owlet-ECQ
Diagnostics / Faults
L-BAL-F062-GB 2022/20 Index 004
Part.-No. 00702389-GB
16/24
