Bosch SHI 4302 Troubleshooting Tips page 20

Page D-3
SHU/SHI/SHV Dishwasher Troubleshooting Chart
Problem
ü ü ü ü Dishwasher
won't stop filling
or won't stop
draining.
ü ü ü ü Water doesn't
drain properly.
CAUTION: Use caution
when removing debris
from sump to avoid being
cut by sharp debris such
as aluminum can tabs or
broken glass.
ü ü ü ü Water fills too
slowly.
st
1 Edition/Revision 0-A
Possible Cause
ü ü ü ü Water in dishwasher base
from leaky or loose hose.
ü ü ü ü Dishwasher isn't level,
causing float switch (e 6) to
operate.
ü ü ü ü Float switch or diaphragm
(e6) failed.
ü ü ü ü Debris in dishwasher base
activated float switch (e6).
ü ü ü ü Kink in drain hose.
ü ü ü ü Dishwasher filter(s) or sump
clogged.
ü ü ü ü Drain motor impeller clogged.
ü ü ü ü Kitchen sink or sink air gap
clogged.
ü ü ü ü Drain motor (m 3) failed.
ü ü ü ü Timer (SHU 30/40 models) or
module (all other models)
failed.
ü ü ü ü Improper drain connection
height (< 20" or 508mm
above floor).
ü ü ü ü Low customer water supply
pressure.
ü ü ü ü Inadequate customer water
supply piping.
ü ü ü ü Scale in customer supply
piping or dishwasher
piping/parts from hard water.
Suggested Action
ü ü ü ü Turn off dishwasher, drain water
manually from dishwasher base and
reinstall or replace hose.
ü ü ü ü Level dishwasher using front and rear
leveling legs (see customer dishwasher
installation instructions).
ü ü ü ü Turn off dishwasher and replace float
switch or diaphragm.
ü ü ü ü Turn off dishwasher and remove debris
from dishwasher base
ü ü ü ü Straighten or replace drain hose.
ü ü ü ü Clean dishwasher filters or sump.
ü ü ü ü Turn off dishwasher, remove drain
motor cover (in sump) and clean
impeller. If necessary, remove drain
motor to clean impeller.
ü ü ü ü Unclog sink or sink air gap.
NOTE: Cleaning sink air gaps or sinks are not
covered under warranty.
ü ü ü ü Turn off dishwasher and measure
resistance at motor terminals (≈ 16.5
Ω). Replace faulty motor.
ü ü ü ü Check voltage at and wiring to timer or
module. Turn off dishwasher and
replace faulty timer or module (for
SHU/I 43/53 models, install existing
module jumper onto new module).
ü ü ü ü Install drain height and sink air gap
according to local codes.
ü ü ü ü Adjust customer water supply pressure
(to 5-20 psi or 0.3-8.27 bars).
ü ü ü ü Install appropriate piping to dishwasher
(minimum 3/8" copper tanking)
according to local codes.
ü ü ü ü Clean or replace clogged piping/parts
and have customer get water tested
and use appropriate water softener.
Tuesday, May 11, 1999
B