Water Switch - Bosch SHEM63W55N Repair Manual

Design and function

3.9 Water switch

Mounted to sumps, water switches consist of a motor-operated disk with seven holes,
which rotates under three sump ports (upper / lower spray arms, top sprinkler) to
provide precise water control.
Fig. 41: Water switch detail
1 Disk
2 Housing
3 Seal (to sump)
4 Pulse generator
5 Drive motor
6 Gear with cam
7 Gear with shaft
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Fig. 42: Water directed to both spray arms / top sprinkler
1 To upper spray arm
2 To lower spray arm
3 To top sprinkler
Water switch disks do not rotate continually, but counterclockwise (ccw) based on the
wash program and water clarity (i.e. directed by the power module and aqua sensor).
When water is clear, the water switch directs water to the upper or lower spray arm.
When water is dirty, the switch directs water to both spray arms.
Fig. 43: Water switch rotation
1 To both spray arms / top sprinkler
2 To lower spray arm
3 To upper spray arm / top sprinkler
4 To upper spray arm
Motor ratings: 110 - 127 VAC, 60 Hz, synchronous, 4.8 RPM (ccw), class E insulation.
Copyright by BSH Hausgeräte GmbH Page 24 of 126