Appliance Repair Q & ACategory: DishwasherDishwasher control panel light flashing.
Dave Clancy asked 1 month ago

My dishwasher is a whirlpool model DUL300XTLQ3.  Three lights (cancel,normal,sanitize) on the control panel are flashing and the unit will not respond at all. Is my control unit broken?  This unit does not have a display, so no failure codes are available.

1 Answers
Master Tech Staff answered 1 month ago

If the dishwasher control panel lights are flashing and the control will not accept any input at all, first kill power to the unit at the breaker for 10 minutes restore power and see if it will reset, if not then either the keypad has a stuck or shorted key or the main control is not accepting input from the keypad. To diagnose this problem and figure out if the keypad or control is causing the problem first thing to do is rule out the keypad.
General Keypad Inspection:
Unplug dishwasher or disconnect power.
■ Check keypad ribbon tail for broken/shorted/ corroded/creased traces.
■ Check for loose connection to control.
■ Check for evidence of contaminants or corrosion around perimeter of the keypad, on the keypad ribbon tail and/or on the keypad connector at the control.
■ Perform keypad function check.
Checking keyswitch contacts:
■ Unplug dishwasher or disconnect power.
■ Remove connector P1 from the control board.
Using the table below, measure the resistance across the switch when the key is pressed.
NOTE: The meter must be connected with the proper polarity.
If using an ANALOG readout meter: The resistance reading should go from infinity (open circuit) down to a readable ohm level. The level may be different depending on your meter, since there is a diode in the circuit.
If using a DIGITAL readout meter: The resistance reading should go from infinity down to a readable ohm level. The level may be different depending on your meter, since there is a diode in the circuit. If available, you could use the “Diode Test” function of a digital meter, which will give a voltage of about 1.2 VDC during the test.
➔ If any switches fail this test, replace the console panel/keypad assembly.
➔ If all switches test OK, replace the machine control board.