Bosch SHU33A02 - Circulation Pump - Checking PTC Starter (1)

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VIII. Troubleshooting
VIII. Troubleshooting
Heater
Heater
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Troubleshooting Flowchart
With heater on
(during test
program), measure
dishwasher
incoming current
(black wire).
If ~ 11A,
heater is
working
fine.
If ~ 1.5A,
heater
circuit has
failed.
Measure
voltage @
control
module.
If ~120 VAC,
check heater
circuit.
If ~ 0 VAC, control module
(heater relay) has failed.
Replace faulty module.
Measure
resistance
@ heater
terminals.
If ~11 , check
high limit &
flow switch.
If  , heater
has failed
(opened).
Replace
heater.
If ~ 0, heater
has failed
(shorted).
Replace
heater.
Measure high
limit & flow
switch
resistance.
If high limit ~ 0.3  & flow
switch ~ 0.4  , check wire
harnesses. Replace faulty
harness.
If high limit or
flow switch =  ,
replace faulty
part.
START
Troubleshooting Flowchart
NOTE: Flow through heaters
heat water ~ 2ºF / minute.
Can also measure heater
current @ module red
heater wire (~ 9.5A).