Bosch SHP65TL5UC Repair Instructions page 22

The motor senses if the pump is blocked. Using brief, intermittent
bursts, the pump tries several times to loosen the blockage.
If draining is disrupted by a blockage or kink in the drain hose,
draining is stopped and an error code is stored in memory.
4.5.3 Solving installation issues
Often improper installations, not drain pump issues, cause
dishwashers to not drain properly.
 Must have drain hoses with high loops (min. 33" high)
or drains with air gaps.
 To avoid damaging drain hoses, place high loops
inside cabinets near customer drain connections, not
next to dishwasher tanks.
 Drain hoses are 92" long and can be up to 150" long
(with SGZ1010UC / service # 663105) extension.
 Run drain hoses through left or right straps at rear of
dishwasher bases.
 Make sure drain hoses aren't kinked.
4.5.4 Cavitating
Cavitating may occur in any type of pump when impellers spin
faster from low inlet / outlet pressure, creating air pockets
around impellers. Cavitating pumps can be noisy. Air gaps /
high loops keep water contacting pump outlets, preventing air
pockets from forming.
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4.5.5 Siphoning
Siphoning may occur in any type of drain pump when low water
flow allows a siphon (suction) to develop, pulling waste water
back into the pump. Sump check valves along with air gaps /
high loops prevent siphons from being created.
4.5.6 Johnson Tee applications
For installations with a Johnson Tee, the Johnson Tee must be
installed in the wall behind the dishwasher, no more than 50" (at
it's maximum height) above the floor. The connection must be ¾"
minimum – ½" must not be used. Dishwasher drain hose
extensions must not be used.
1. Johnson Tee
1
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