If you have a flashing light above one of the keypads on your Whirlpool dishwasher, the keypad may be shorted. This does not apply to the Clean Light blinking in a sequence of seven blinks, pause, seven blinks, etc.; more on that here and here.

The dishwasher's tech sheet is located behind the bottom kick panel. Remove the panel to retrieve the tech sheet-- it has a procedure for testing the key pads on the touchpanel.

But in case someone with sticky fingers done stole your'n, this awwta git it fer ya:

from the tech sheet:

PROBLEM: Won’t Run and LED Above Key(s) is Flashing Rapidly

Short circuit(s) in keypad or in control’s input lines that read the keys.

CHECKING KEYPAD OPERATION

A rapidly blinking LED over one of the keys of the keypad (or sometimes a “dead” keypad / console)

indicates one or more key switch lines are stuck or shorted on either the control or the keypad.

To determine if the control or keypad is faulty, do the following test:

1. Unplug dishwasher or disconnect power.

2. Open the dishwasher door.

3. Open console and disconnect the keypad ribbon connection from the control (at P1).

Make sure all other connections are made.

4. Put console back together. Do not close the dishwasher door.

5. Plug in dishwasher or reconnect power.

6. Wait 5 seconds.

7. Close dishwasher door.

8. Monitor the control’s response:

➔If the control is OK (no longer sees shorts with the keypad unplugged),

it will respond by turning on a Drain Motor for 2 minutes.

Check and/or replace the keypad if the control responds OK.

➔If the control is not OK (still sees shorts with the keypad unplugged),

then the drain motor will NOT respond and will remain off.

If no response, replace the control.

If a keypad does turn out to be shorted, the fix is to replace the touchpanel ==> Touchpad and Control Panel

Source: Whirlpool DU1055XTSS1 Flashing LED at Pots and Pans button and will not run