Aporte original por: David Cochrane ,
For those who will search for the same problem later: you should carefully read troubleshooting page for Whirlpool dishwashers. For example, [link|https://www.dishwashermanual.com/whirlpool/wdf520padm/user-instructions/|Whirlpool WDF520PADM user manual] on page #14 has an information that there is special optical sensor installed in dishwasher which also detects water temperature while cycle is running. Even short cycle could be longer because of not adjusted sensor. You should adjust it during the first wash after installation.