Here are your parts
Control panel parts replacement parts for WHIRLPOOL KUDS01FLSS1 Undercounter Dishwasher | AppliancePartsPros.comHere is a tech sheet
http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208537797.pdf[COLOR="Blue"]now, when i select wash options, the LED lights light up.[/COLOR]
When you say the LED lights up I assume you mean the correct one lights.
[COLOR="Blue"]when I select start button, the dishwasher wont start.[/COLOR]
Could be you just knocked a connection off or loose.
Unplug , check and re-seat all connectors.
Check that the door switch closes properly.
It is possible that some dirt got in the keypad connection.
Connector Cleaning / Checking
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.
If this does nothing check that the start switch output from the keypad is OK, see the tech sheet.
