OK here is the update. After checking out connections etc, I decided to do the UNTHINKABLE and get the lighter out to see if I could get the pilot/gas going. As I could smell a faint odor of gas, told me that the pilot was putting out gas. So after letting the unit rest and let the gas blow out if there was any, I put a flame next to the igniter and hit the switch, and in a moment, the unit fired up and the spa went to temperature. Good news, now to figure out why. After cool down I got my finger in there to feel what was going on...and all this rust came falling down and out. The metal bracket that holds something (including the igniter) was pretty well falling apart. It turned out that once I cleared all the rust out with my compressor and cleared the igniter, the unit fired up on its own. Bottom line, rusted metal was in the way of the igniter, and it would not click to ignite the pilot. Once the metal was cleared, I heard the clicking noise that lights up the pilot. WhoooooHoooo. Funny thing, I asked my buddy that installs home heating and ac about it, and he said "spider in the igniter" several times, and I thought he was joking. But apparently it is fairly common that something like a spider web can cause the igniter to temperarily fail.