If you can - unplug the blower and ozone from the control box. Try the breakers. If it works, you just have water in one or both. That can trip the breakers. Not uncommon when a used spa gets moved.
Another thought: I have had countless electricians wire spas incorrectly on one particular point. You may be able to simply call your guy and ask him this - The Neutral wire which goes to the spa: where exactly did he land it in the sub-panel? With GFI breakers, you do NOT land this Neutral wire on the Neutral buss, like he would do on any other job. That white wire must go directly to the GFI breaker, not the Neutral bus bar. And - if he did miss this, it would NOT trip if he pulls all four wires at the spa.
Give that a try...
HTH
