There is no power to the equipment. The pool or spa light will not turn on.

Reset the circuit breaker at the sub or main electrical panel. Pool/spa equipment should be on its own circuit. There may also be a GFI/GFCI outlet at the equipment. (See electrical section for more information about GFI/GFCI outlets). Be sure it is in the reset position. Spas may also have a designated reset button.