Refilled hot tub yesterday and can’t restart. Breaker keeps shutting off. The display message says ICE and 48. Stays on for about 10 seconds then shuts off. Any suggestions before I book a service call??

Refilled hot tub yesterday and can’t restart. Breaker keeps shutting off. The display message says ICE and 48. Stays on for about 10 seconds then shuts off. Any suggestions before I book a service call??