H.Koenig STC56 Manual De Usuario página 4

any hair roll or other rubbish block up the air inlet
(including the hose and the spile), otherwise motor
failure and housing distortion may be caused. If the
matters absorbed in forms a blockage, stop the cleaner
by pulling out the power plug immediately to clean the
blockage.
8.When using the cleaner, don't plug up the air
outlet by towel or other matters, otherwise the efficiency
of dust absorbance will be influenced, and the motor
will be at high risk of being burnt out.
9.Never use the cleaner at uneven floor or ground;
and be very careful when cleaning stairs to prevent the
cleaner from falling down.
10. Never absorb live stumps with the cleaner,
otherwise the motor may be damaged.
11. The cleaner should be kept far away from heat
sources (such as central heating, oven, etc) to avoid
the distortion of plastic parts as well as the influence
caused by such distortion.
12. Before using the cleaner, please remove big
and sharp matters on the floor to avoid damaging the
plastic parts, filter gauzes and motor.