Bosch SHU53 - Page 15

BA Page D-4
SHU/SHI/SHV Dishwasher Troubleshooting Chart
1
st
Edition/Revision 0-A Tuesday, May 11, 1999
Problem Possible Cause Suggested Action
ü
üü
ü Water won't fill.
NOTE: An "F" fault code
in the display for SHU/I
53/68 dishwashers
shows there's a filling
problem (
not filling, over-
filling, underfilling or water in
the base
). The fault code
can't be reset manually –
it will reset itself 15
minutes after the
dishwasher has been
turned on (after testing
how it fills).
ü
üü
ü Customer water supply
turned off or disconnected.
ü
üü
ü Water valve (s2) failed.
ü
üü
ü Water level switch (f1) failed.
ü
üü
ü Timer (SHU 30/40 models) or
module (all other models)
failed.
ü
üü
ü Water in dishwasher base
operated float switch (e6).
ü
üü
ü Reconnect and turn on customer water
supply.
ü
üü
ü Check resistance @ water valve
terminals (≈ 1000 Ω). Turn off
dishwasher and replace faulty valve.
ü
üü
ü Turn off dishwasher and replace faulty
level switch.
ü
üü
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
üü
ü Turn off dishwasher, drain water
manually from dishwasher base, find
source of leaking water and fix water
leak.
ü
üü
ü Detergent or
rinse aid won't
dispense
properly.
ü
üü
ü Dispenser actuator (A2)
failed.
ü
üü
ü Detergent dispenser door is
jammed.
ü
üü
ü Turn off dishwasher and replace
actuator.
ü
üü
ü Free jammed detergent dispenser
door.
ü
üü
ü Refill rinse aid
light won't come
on
(SHU/I 53/68 &
SHV 48 models).
ü
üü
ü Rinse aid level switch (reed
switch e3) failed.
ü
üü
ü Turn off dishwasher and replace reed
switch.
ü
üü
ü Water doesn't
circulate.
ü
üü
ü Circulation motor (m2) failed.
ü
üü
ü Timer (SHU 30/40 models) or
module (all other models)
failed.
ü
üü
ü Turn off dishwasher and replace motor.
ü
üü
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
üü
ü Water doesn’t
heat up properly.
ü
üü
ü Hi-Limit (f5) tripped and failed
to reset.
ü
üü
ü NTC (temperature sensor)
failed.
ü
üü
ü 140
o
F (f3) or 161
o
F (f4)
thermostat (SHU 30/40
models) failed.
ü
üü
ü Run test program (SHU/I 43/53/68
models) – measure current to
dishwasher. If current ≈ 11A, Hi-Limit
is OK. If not (and for all other models),
turn off dishwasher and measure
resistance @ Hi-Limit terminals (≈ .3
Ω). Replace faulty Hi-Limit.
ü
üü
ü Turn off dishwasher and check
resistance of NTC (≈ 55 kΩ @ 72
o
F).
Replace faulty NTC.
ü
üü
ü Turn off dishwasher and replace faulty
thermostat.