I had a power surge at my house yesterday and had to reset all the settings on my aqualink unit. I'm fairly certain the indoor LED background display light didn't constantly stay illuminated. Now it does. I've checked the settings and I only have the option for turning it on and off on the RS4 menu, no 2 minute delay like the general RS manual highlights. I'm pretty sure it would automatically dim after a couple of minutes of hitting a button. I've also tried clearing the memory and changing the 9v battery on the main unit outside. Any other ideas?