You have what Whirlpool calls a Type 3 Control Panel. If you don't have the unit operating in
Continuous Mode, the fan will operate only, when the compressor turns on to extract the humidity, based on the level of extraction you have it set on. If you haven't already,.set the control on Maximum and Continuous Mode.
If that doesn't solve the problem, turn the Master ON/OFF Switch to OFF and unplug the unit for 15 minutes. After the time has elapsed plug the unit back in and turn the Master ON/OFF Switch to ON. Hopefully, the 15 minute timeout, allowed the unit to reset itself and revert back to the original factory settings. If so, you can set the controls as you like.
To further assist you, I have an included a link to your Owner's Manual, in case you have misplaced your. You can download and print it for future reference.
https://www.whirlpool.com/digitalassets/MLPDF/Use%20and%20Care%20Guide%20-%201188826.pdfI hope this helps you to further troubleshoot and solve the problem. Please let me know. Thanks.