A new poster in the pool biz (who is now restricted to the pool biz only ghetto on the forum) claimed this problem is often caused by a spa side control . . . if you have one. No idea if he's right or not -- all I know about him is that he can't read and follow instructions -- but it wouldn't be hard to check.

Otherwise, a call to Hayward is probably in order -- 888-Hayward.

Good luck.