Bosch SHI4302 Manual page 67

VIII. Troubleshooting
VIII. Troubleshooting
Problem
Water doesn't
circulate.
Water doesn't
heat up properly.
Dishwasher cycle
runs too long, yet
dishwasher washes,
rinses and shuts off
OK.
Water leaks from
front of dishwasher.
NOTE: For minor problems from improper usage or lack of maintenance, please refer
customer to the Self-Help chart in their Use and Care Manual.
Use a multimeter with temperature, voltage/resistance and current
NOTE:
(ampere) probes. Do all resistance checks with power turned off. Identify each wire
color and location at the control module before looking at this chart.
You will need a T20 Torx screwdriver and may need #1/ #2 flat blade
NOTE:
screwdrivers and a pair of needlenose pliers. Many parts can be snapped out without
using tools.
Symbols for parts (e.g. " f3" or "e6 ") refer to those on circuit/wiring
HINT:
diagrams.
(continued)
(continued)
Possible Cause
Circulation motor (m2 ) failed.
Timer (SHU 30/40 models ) or
module (all other models ) failed.
Hi-Limit (f5 ) tripped and failed to
reset.
NTC (temperature sensor) failed.
Heater (r1 ) failed.
Water flow switch (e5 ) failed.
Timer (SHU 30/40 models ) or
module (all other models ) failed.
Customer hot water supply isn't
o
hot enough (< 140 F/ 60
Blocked or clogged upper or
lower spray arms.
Excessive foaming.
Turn off dishwasher and replace motor.
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 ).
Run test program & 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.
Turn off dishwasher and check resistance
of NTC ( ≈ 55 k Ω @ 72
Run test program & measure current to
dishwasher. If current ≈ 11A, heater is OK. If
not (and for all other models), turn off
dishwasher and measure heater resistance ( ≈
11 Ω ). Replace faulty heater.
Run test program & measure current to
dishwasher. If current ≈ 11A, flow switch is
OK. If not, remove flow switch microswitch,
close its contacts & measure its resistance ( ≈
.4 Ω ). Replace faulty flow switch.
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 ).
Adjust hot water supply according to local
o codes.
C).
Check spray arms – clean or replace as
needed.
See Suds or foam remains in
dishwasher on page xx.
65
Suggested Action
o
F). Replace faulty NTC.