Circulation Pump - Bosch SHI 4302 Troubleshooting Tips

Page D-1
SHU/SHI/SHV Dishwasher Troubleshooting Chart
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.
Problem
ü ü ü ü Washability
problems
(dishwasher
won't clean
properly)
HINT: Water level will
not affect washability as
water fill is measured by
pressure, not time –
water level cannot be
adjusted.
st
1 Edition/Revision 0-A
Possible Cause
ü ü ü ü Inappropriate dishwasher
detergent used.
ü ü ü ü Blocked or clogged upper/
lower spray arms.
ü ü ü ü Water doesn't circulate
properly due to debris in
circulation motor impeller.
ü ü ü ü Filter not locked down
securely, allowing debris to
enter sump.
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 Drain hose behind
dishwasher doesn't have an
adequate loop.
ü ü ü ü Partially clogged air gap,
allowing wastewater from
prior washes to circulate in
dishwasher.
ü ü ü ü Water doesn't drain properly
ü ü ü ü Soap doesn't enter
dishwasher due to dispenser
actuator (A 2) failure.
Suggested Action
ü ü ü ü Instruct customer to use a powdered
dishwasher detergent (e.g. Cascade
powder).
ü ü ü ü Check spray arms – clean or replace
as needed.
ü ü ü ü Twist and remove filter, then remove
debris from right side of sump where
water enters circulation pump impeller.
If debris has jammed impeller, turn off
and pull out dishwasher, remove tank,
remove circulation motor and unscrew
and clean out impeller.
HINT: If impeller is damaged, replace entire
impeller assembly or it won't seal adequately.
ü ü ü ü Twist and remove filter, then remove
debris from sump. Instruct customer to
twist and lock filter (cylinder) securely
into sump.
HINT: Due to high temperature rinse (161
breaking down food debris and triple filtering
system trapping food debris, filters shouldn't
normally clog up. Problem often caused by filter
not being securely locked down. Instruct
customer to twist and lock filter (cylinder)
securely into dishwasher sump.
ü ü ü ü Loop drain hose behind the dishwasher
(with the top of the loop) at least 20"
above the floor.
ü ü ü ü Unclog sink air gap.
NOTE: Cleaning sink air gaps is not covered
under warranty.
ü ü ü ü See Water doesn't drain properly on
page D-4.
ü ü ü ü Turn off dishwasher and test actuator –
replace if faulty.
Tuesday, May 11, 1999
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