It sounds like you have a GE model GSD2230 dishwasher.
Manual here:
https://www.myapstore.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=980500032.PDF
That should give you hints what to look for.
When it is supposed to be emptying does it make any sound - maybe a humming like a motor is running?
Check the drain pump for blockages.
Make sure the drain hose is clear and not kinked
There's plenty of other advice that will pop up if you do a search.
Ejeejdj, March 2023