Sump; Sump Basics; Suction Cap; Drain Pump Cover - Bosch SHEM63W55N Repair Manual

Design and function

3.8 Sump

3.8.1 Sump basics

Filtered water drains into the sump, where it is pumped through the water switch into
the spray arms or drained out. The sump provides mounts for the heat pump, drain
pump, water switch, aqua sensor and drain check valve.
Fig. 37: Sump parts
1 Drain pump
2 Outlet to lower spray arm
3 Outlet to top sprinkler
4 Outlet to upper spray arm
5 Water switch
6 Water switch motor
7 Heat pump
The inside of the sump has a couple of caps/covers to enhance water flow.
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Fig. 38: Sump interior with drain pump cover and suction cap
1 Aqua sensor
2

Drain pump cover

3

Suction cap

3.8.2 Suction cap
The suction cap provides proper water flow through the sump when the heat pump is
running, prevents air or dirt from being drawn into the pump and provides access to the
heat pump impeller. It should not be removed.
3.8.3 Drain pump cover
The drain pump cover directs waste water through the drain pump. Without it, the drain
pump cannot build up any pressure.
Customers may remove the drain pump cover for cleaning, but must reinstall it. If the
cover is not correctly attached, water cannot be pumped out.

3.8.4 Drain check valve

The drain check valve is located inside the sump at the outlet to the drain hose. It al-
lows waste water to exit the sump and prevents it from entering the sump.
Copyright by BSH Hausgeräte GmbH
For proper draining and pumping, the drain pump cover and suction cap
must be securely snapped into place.
Snap in the drain pump cover tightly to avoid drain pump cavitating and
to provide proper draining.
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