ITC HD7515 Manuel D'instructions page 24

Troubleshooting
PROBLEM
24
POSSIBLE CAUSE
Blocked hose
Obstruction in the piping
system
Troubleshooting
CORRECTIVE ACTION
Plug the handle end of
the hose into the suction
inlet, thus reversing the
suction in the hose.
Cover the gap around
the handle, to ensure
suitable suction strength,
and ensure contact with
inlet contacts to start the
unit. This should clear
the hose
Remove the screw from
the air intake connector,
to free the central vacuum
unit from the piping
system. Start the unit by
plugging the hose into a
vacuum inlet. By placing
your extended hand over
the air intake opening on
the unit, check the suction
strength on the unit itself. If
suction strength is normal,
the obstruction is in the
piping system. If suction
strength is diminished or
completely absent, have
the unit checked by an
authorized service center.