norts

Just did a water change on my 2005 bullfrog dual-pump spa and now I'm having issues. Turned power back on to spa after water change and control panel was operating normally. Came back two hours later to find the temp had risen only 3 degrees. I tried to push the 'temp up' button but found none of the buttons would work. I turned the breaker off for 10 minutes to see if that would reset it but no luck - still dead. Only now there is no temp being displayed, the F1 and PL lights are on and the pump is circulating. Any help on this is greatly appreciated! Thanks in advance, Norts