I would confirm the pump does run by hooking it direct to 220v assuming it's a 220v motor. If it runs, then need to confirm you have 220 running to the system. My guess would be a bad board, but it could be a bad temp sensor and the system is not calling for heat again assuming it's a no circ pump spa and it uses a 2 spd to heat the water. Then call the tech you paid to check it out and tell him you want your money back or come and figure the problem out.
What brand spa is it and what equipment is in it?