Numatic MVD 570 Owner's Instructions Manual page 6

Low Flow Indicator
Slow Repeated Flash
This indicates that your filter bag has become full. Please change the bag.
If the fault persists check the following:-
Dust caps still fitted
Blocked hose
Cloth filter clogged
Hepa cartridge clogged
Constant Red Light
This indicates a possible machine fault or that the auxiliary socket has become overloaded.
If the auxiliary socket is over loaded the machine will cut out.
Switch off the machine to reset.
If the fault remains check the fuse.
Cause
Bag full
MV (A), MVD (A) Warning Light
Remove the caps.
Unblock the hose.
Remove and replace
Remove and replace, clean dirty filter by vacuuming.
Replace, seek advice from an instructed
person or manufacturer.
6
MV, MVD Warning Light
Solution