Bosch SHU53 - Measuring Resistances from the Front of SHU 99 & SHV 43;48 Dishwashers

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TEST TIME NOTES
Using the test program to troubleshoot the
heater, flow switch and Hi-Limit thermostat from
the front of SHU/I 43/53/68 dishwashers
NOTE: Once its found one of these parts is faulty (from
incoming current being 1.5 - 2A), check each part (once tank
has been removed or blocked up) by measuring its
resistance at its terminals:
n Heater ~ 11 W
n Hi-Limit ~ .3 W
n Flow switch ~ .4 W -- must remove microswitch
from heater housing & close its contacts to
measure this. A spring loaded plunger closes
microswitch when water is flowing.
Entering test program ----- Press On/Off button at the same time you
press both the
Power Scrub Plus & Regular
Wash
buttons (SHU/I 43 models) or the Scrub
Wash & Delicate/Econo buttons (SHU/I 53 &
68 models). Indicating lights will flash.
Starting test program ----- Press both the Power Scrub Plus & Regular
Wash buttons (SHU/I 43 models) or the Scrub
Wash & Delicate/Econo buttons (SHU/I 53 &
68 models) a 2nd time.
Skipping a test ----- Press Scrub Wash button (SHU/I 43
models) or Regular Wash button (SHU/I
53 & 68 models).
Draining 30 seconds Allow dishwasher to drain.
Aqua Sensor calibration 65 seconds Not on SHU/I 43 models. Skip this test.
Filling Until water level switch closes Cant skip this test
Heating & Circulating Until water reaches 150ºF Dont run entire test (to save time) -- when
(rises ~ 2ºF/minute) water starts circulating, measure current in
main power line to dishwasher. Skip test once
current has been measured. If current is ~
11A, heater, flow switch and Hi-Limit are OK.
If current ~ 1.5-2A, turn off dishwasher,
remove or block up tank and measure
resistance of heater, Hi-Limit & flow switch
(see below).
Draining 60 seconds Last test. To end test program, press
On/Off button (all models).
F
Heater
185ºF
High
Limit
Flow
switch
Page B-1
1st Edition/Revision 1 Tuesday, August 8, 2000
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