Aquabot Turbo - Remote Not Working

by West
(Tulsa)

The remote used to work on my Aquabot Turbo, activating pistons on either side to make the robot turn. Recently, the remote does not cause the pistons to extend. I have changed the battery. The remote still lights up (red light) so it seems fine.

Does the wireless signal go through the transformer or straight to the robot? How do I troubleshoot this?