6.2
Troubleshooting
6.2.1 Heater diagnosing
Test programs heat the water to 150ºF at ~ 2ºF / minute. To
save time, don't run the entire test – when water circulates and
the heater is on, measure the incoming current to the dishwasher.
If the current is
~ 11A
, the heater is OK. If the current is
~ 1.5
–
2A
, the control or heater could be faulty.
At the control or heater, measure the voltage between the large
red
heater wire and a chassis ground or the dw neutral (WHRD
on/off switch or flow switch wire). If the voltage is 120 VAC, the
control is OK. If the voltage is 0, the heater relay has failed –
replace the control.
To check the heater, turn off the dishwasher, block up the tank
and check the resistance of each part of the heater as follows.
Heater ~ 11
Ω
Hi-Limit ~ .3
Ω
Flow switch ~ .4
Ω
. A spring
loaded plunger closes it when water
is flowing, so you must remove the
microswitch from the heater and
close its contacts to measure the
resistance.
TIP:
Current can be measured through the
red
heater wire at the
control or heater (
~ 9.5A
). There can be more than one red wire,
so check the wiring diagram to select the heater wire.
NOTE:
Open door to run test program for fully-integrated models.
6.2.2 Controls timing out and showing “1”
Occasionally dishwashers can run for hours, not finish washing &
show a “
1
” in the display. This means the module has timed out
due to an unidentified heating problem --
all
heating related parts
must be checked until the problem is found.
Heating system checklist if controls time out:
Check control module heater relay & solder joints.
Check wire harness & terminals (to control and heater).
Controls have been replaced when the problem was loose
connections.
Check heater resistance (~ 11
).
Check flow switch (~ 0.4
). If flow switch is OK & water
doesn’t flow, check circulation pump.
Check NTC (~ 55k
@72ºF) and Hi-Limit. See NTC
resistance chart (section 6.3.3).
IMPORTANT:
Whenever a “
1
” shows in the control display, reset
the control after fixing the heating problem by running the
dishwasher. The module resets after the 1st run.
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Flow
switch
