I think you may not be far off with 'vapor locked'. When you drain a spa, you can get air in the intake lines and the pumps can't prime. If you have your manual, there is probably something in it about bleeding the lines or priming the pumps.
The Keys website is www.keysbackyard.com. I couldn't find a manual on line, but they have these contact numbers: Keys Backyard, L.P.
2901 W. Kingsley Rd.
Garland, Texas 75041
General Assistance: 800-408-9000
Technical Service: 877-897-7493
If you can't wait until you can talk to them, you can often bleed the lines by slightly loosening the fittings at the pumps until the air bleeds out and the water can flow. Then retighten them. I'd do it with the power off...Also, make sure the water level is high enough in the tub to be filling the filter.
Good luck
Thank you so much...I can't find my manual so I will have him try loosing the fittings and see if that works if not I will have him call the numbers you provided. Again, a big thank you!!!