Circulation Pump – Replacing Impellers; Impeller Ceramic Ring Color Code - Bosch SHI4302 Manual

VIII. Troubleshooting
VIII. Troubleshooting
Circulation Pump
Circulation Pump
Occasionally, a circulation pump impeller can stick if a dishwasher hasn't been used for a
long time. Impeller ceramic rings and carbon rings had been changed (during January,
2001) to reduce or eliminate impeller sticking (ceramic rings are located around shaft on
rear of impeller).
For temporary repairs when impeller replacement isn't possible, impellers can be loosened
by rotating them (through the sump) using an 8mm nut driver (impellers should be replaced
shortly thereafter when repairs are possible).
Sump
Access port to
impeller through
sump
INSTRUCTIONS
IMPELLER:
To loosen stuck impeller, access sump by
removing microfilter and sump screen.
8mm
Insert an
hole to impeller -- place nutdriver onto
8mm stud on impeller and carefully rotate
impeller clockwise until it becomes free
(at least two full revolutions).
NOTE:
Upgraded spacers and ceramic
rings (January, 2001 and later) provide
lower friction and less contact area,
preventing impeller
dishwashers haven't been used for long
periods of time.
NOTE:
Impellers should be replaced
(instead of
possible. Loosening impellers should
be done only on a temporary basis.
–
–
8 mm nutdriver
FOR LOOSENING
nutdriver through sump
sticking when
loosened) whenever
Replacing Impellers (1)
Replacing Impellers (1)
HINTS:
Impeller
HINT:

Impeller ceramic ring color code:

Bright white -- upgraded ring
Pink --
upgraded ring
Dull yellow/cream --
should be replaced)
Dull white (off white) -- old ring (impeller
should be replaced)
75
Upgraded impellers (with upgraded
ceramic rings) and carbon rings fit
both old 263835 and new 266511
(softer bearing) circulation pump
motors (and corresponding pump
housings).
Check color of impeller ceramic
rings as shown below to determine
upgraded (January, 2001 & later) and
old (December, 2000 & before) style
rings.
Make sure black spacer is reinstalled
-- failure to reinstall spacer can
cause motor to bind.
old ring (impeller
UPGRADED OLD STYLE