Rinse only light keeps blinking. I can’t cancel it so it won’t run
Have you tried removing power from the unit for a couple minutes to see if it will reset?
Either unplug it or shut the breaker off.
Yes, that’s always my first "fix". Didn’t help
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=GU1500XTKQ0
See the attachment for the tech sheet.
This may also come in handy.
http://appliancedigest.com/index.php?/files/file/284-whirlpool-kd-12-point-voyager-dishwasher-service-manual/
You have to join the site to download the manual but it is free and this is a very good site for manuals and other info for the appliance repair DIYer.
Could be a stuck key.
The usual way to troubleshoot this is to check the keypad output with a meter. If it is OK then replace the control board. If not replace the keypad.
Still a bit of a crap shoot but your odds are better.