Do Lights Coming On Control Panel

Dishwasher Repair
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1

Our Whirlpool 980 Series Dishwasher will not do anything. No lights will come on the user interface. Have confirmed the following items:

  • the thermal fuse is good. Have tested with OHMs meter.
  • have tested and confirmed current to and through the door switch.
  • have tested and confirm current through the thermal fuse.

Any ideas on additional things to check and/or test? Thanks in advance for your help!

2

Here are your parts
Replacement parts for WHIRLPOOL DU980QPDQ4 UNDERCOUNTER DISHWASHER | AppliancePartsPros.com

See the attachment for the tech sheet.

With both door switches closed you should have 120 volts at P7 to P8 on the control board.

If you do then odds are that the control board is shot.

The tech sheet does not give the wiring for the keypad so you cannot check it but totally dead usually points to the control board.
This is still a gable but that is where I would look.

You could try the following but I would say it is a long shot.
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.

Remove the control board and check for cold solder joints.
They are usually a duller gray or have pin holes.
Wiggle the components to see if their legs move on the solder side of the board.
A magnifying glass can be useful when doing this.

Check the components for any sign of a fault.
DU980.pdf (650.7 KB)