We have been trying for weeks to try and get someone out here to fix our spa...with no luck. Can anyone tell me what an F4 error code means. We bought this house and the spa came with it, so I don't have the manuel. The side of the spa says 3-1-99 and it is from Cal Spas. I am assuming it is a 99 model.

Any help would be appreciated!

Thanks,
Cindy

Usually F4 indicates a blown fuse on the circuit board (usually labeled F4)