Help....We just installed a new circuit board(piece of cake) and now
the fiber optics won't turn on even though the control panel shows a
sun which indicates lights are on. I don't hear an y sound as if it is eve n
activating as I have in the past. Any ideas????

What kind of spa and circuit board. Coast Spas has FO and You have to have the low level programing set to accept FO lights.

Thanks Robert
I have a catalina spa with a balboa board. It worked fine before we changed the board due to a heating problem which it fixed. Now everything is working wonderfully except the lights. The lights are located around the tub rim above the water line as well as a central light in the center of the tub all of which change colors on a rotation of grn, yel , blu,
red , ect....or you can choose a single color. The control indicates the
lights are on but no such luck. Comments?????

Is there a color wheel that makes the lights change color? If so is that turning?If so then it is probably the light bulb. I don't know the FO box very well but it could be as simply as the bulb.