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Fault Diagnostics
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 ~ .4Ω. 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.
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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.
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.
Flow
switch
Making NTC and Hi-
Limit measurements