Bosch SHE55P Repair Manual page 25

4.1.20.2 Backflow (check) valve
The backflow (check) valve is located in the bottom of the sump
near the circulation pump inlet. It prevents waste water from
entering the sump.
Occasionally, older (black) check valves (used mid 2003 &
earlier) have swelled, allowing water to trickle out during washing.
The newer (clear) material doesn't swell – newer shape provides
improved seating after many uses. Part # is still 165262.
New valve
TIP: When washability issues arise, replace check valve along
with other repairs.
702_58300000148618_ara_en_a
Old valve
4.1.20.3 Spray arm feed tube
When water doesn't spray from upper spray arms, check feed
tube where it enters the sump. Occasionally, the joint between
the feed tube and its base can loosen -- the entire feed tube must
be replaced.
4.1.21 Info lights
Many high-end models have models have info lights, which shine
a red light onto floors, letting customers know their quiet
dishwashers are running. When dishwashers finish wash cycles,
info lights shut off.
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