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Replacement parts for General Electric PDW9880J00SS Dishwasher | AppliancePartsPros.com

Here is a manual although it does not actually say it covers a 9800 series it may be close. At least, it is the best I can do.
http://appliancejunk.com/ge/dishwasher/31-9137.pdf

Check to see if the delay hours key works if not then odds are there is a problem with track 11 as it is common to all 3 keys. Could be the keypad or the control board. The usual way to troubleshoot is to check the keypad with a meter if it is OK then replace the control board. Still a bit of a crap shoot but your odds are better.

May just be a dirty connector, see below.
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.