Hi: my name is Garry
Do you have a spa -side remote? Sometimes, when these remotes short out they will give the response you're getting on your indoor panel. If you do have one, unplug it at the connection at the outdoor power center and see if this solves the problem
If you go to the outside power center, unplug the six wire connector(brown connector) located above panel. this is the connector for the spa side remote. If your RS 4 INDOOR CONTROLLER now works normally, you will have to replace the spa side control and NOT the INDOOR controller.
Please try this first. It may appear as though it's your indoor control, but I have had this happen before. the spa side will short out and make it appear as though the indoor control is faulty. If this doesn't solve the problem, then we can look for other ideas that may cause this.