Swami07

I need some help. I bought a used spa from someone. I know, I know. But I did it and if I can get it working without paying a fortune, that'd be nice. Supposedly, everything worked, but when I got it home, there was a cracked union nut and a snapped off pressure switch. I've fixed/replaced both of those. When I turn on the power or push the Jets button, the motor makes a humming sound for a few seconds and then shuts off. No error codes or indication of a problem. I have no idea what to do next. It is a CalSpas Model: 05-5M-CA-31. The closest CalSpas service center is an hour away.