Miele S 421i - Page 4

Technical Information
4
S 2xx, S 3xx & S 4xx Canister Vacuums
5.19 Motor Electronic (Speed Control Board) ............................................................. 51
5.19.1 S 3xx .................................................................................................................... 51
5.19.2 S 4xx .................................................................................................................... 51
5.20 Motor Brushes .................................................................................................... 51
5.20.1 S 3xx .................................................................................................................... 51
5.20.2 S 4xx .................................................................................................................... 51
5.21 Electric Brush Socket (S 254i and S 255i Only) ................................................. 52
5.22 Suction Hose with Integrated Wiring (S 2xx Only) .............................................. 52
5.22.1 S 254i and S 255i ................................................................................................. 52
5.22.2 S 270i - S 276i, S 280i ......................................................................................... 52
5.22.3 S 278i ................................................................................................................... 53
5.23 Turbo Brush (S 2xx Only) ................................................................................... 53
5.24 Buffer/Bumper Strip (S 3xx and S 4xx Only) ...................................................... 54
5.24.1 S 3xx .................................................................................................................... 54
5.24.2 S 4xx .................................................................................................................... 55
5.25 Grill for HEPA Filter (S 3xx Only) ........................................................................ 55
6.0 Fault Diagnosis .................................................................................................. 56
6.1 Improved Castor (S 2xx Only) ............................................................................ 56
6.2 Dirty Dustbag Compartment (S 27x and S 28x Only) ......................................... 56
6.2.1 Dustbags, Old and New Versions ........................................................................ 56
6.2.2 Modified Dustbag Holder ...................................................................................... 57
6.3 Poor Suction Performance (S 27x and S 28x) .................................................... 58
6.5 Poor Blower Performance (S 27x and S 28x) ..................................................... 59
6.6 Dustbag Change Indicator (S 3xx) ...................................................................... 59
6.7 Suction Power (S 3xx) ........................................................................................ 60
6.8 Motor Does Not Operate (S 345i and S 445i) ..................................................... 60
List of Figures
Figure 1-1: S 247i, S 248i ................................................................................................... 8
Figure 1-2: S 249i, S 250i ................................................................................................... 8
Figure 1-3: S 251i, S 252i ................................................................................................... 8
Figure 1-4: S 254i ............................................................................................................... 8
Figure 1-5: S 255i, S 256i ................................................................................................... 8
Figure 1-6: S 234i ............................................................................................................... 9
Figure 1-7: S 269i, S 270i ................................................................................................... 9
Figure 1-8: S 271i, S 272i ................................................................................................... 9
Figure 1-9: S 274i ............................................................................................................... 9
Figure 1-10: S 275i, S 276i ................................................................................................. 9
Figure 1-11: S 278i ............................................................................................................. 9
Figure 1-12: S 280i, S 282i ............................................................................................... 10
Figure 1-13: S 300i, S 301i ............................................................................................... 10
Figure 1-14: S 310i, S 313i ............................................................................................... 10
Figure 1-15: S 321i, S 324i, S326i .................................................................................... 10
Figure 1-16: S 334i, S 336i, S 338i ................................................................................... 10
Figure 1-17: S 342i ........................................................................................................... 11
Figure 1-18: S 344i ........................................................................................................... 11
Figure 1-19: S 346i, S 347i, S 348i ................................................................................... 11
Figure 1-20: S 400i, S 401i, S 402i, S 408i ...................................................................... 11
Figure 1-21: S 410i ........................................................................................................... 11