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Assembly instructions MAXvent
7.2 Possible causes and remedial measures
Type of error
Possible cause
Fan does not run
No line voltage
(anymore)
Line failure
Earth fault
Short circuit winding
thermal motor protection
has triggered (motor is
overheated)
Impeller blocked or dirty
Fan will not start
only for 1 ~ motors: wrong
capacitor (capacity)
Temperature too low for
bearing grease
Fan turns too slowly Line failure
Undervoltage
Incorrect circuit in the case
of a two-speed motor
In the case of Y/D switch-
over: Y instead of D
In the case of Y/YY switch-
over: Y instead of YY
Only in 1~ motors: Capaci-
tor worn
Fan turns in wrong direction --> See this fault type
Impeller / blade scrapes /
brushes
Fan turns in wrong
Only in 3 ~ motors: Wrong
direction
connection (phase se-
quence)
only for 1 ~ motors: capaci-
tor wrong connected
Air flow to low
Fan turns too slowly or in
wrong direction
L-BAL-F054-GB 2018 Index 005
see "Fan does not run"
Part.-No. 00501414-GB
Adjustment
Check linevoltage
Check motor connection and line voltage
Replacing the motor / fan
Check for free air passages; remove foreign bodies if
necessary
see "Impeller blocked or dirty"
Check temperature of supply air
Check voltage
only for 1 ~ motors: check capacitor
- 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"
Select capacity according to the rating plate
Insert bearing with cold greasing
Check line voltage
Connect to suit voltage according to rating plate
replace capacitor
When indicated, clear foreign bodies/dirt from the fan
see "Impeller blocked or dirty"
Switch two mains phases
Connect according to circuit diagram
--> See this fault type
24/32
Trouble shooting
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