Hi - The same thing just happened to me. I've been draining and purging our spa and when I put the remote back on the panel it only displays the battery and the temperature in white with a black screen behind it. I tried depressing on the black screen to reset like CastleTonia mentioned, but it didn't work. Any other suggestions? I have unscrewed the back panel but can't get it off so haven't done anything there yet. Thank you.