Reset the circuit breaker at the sub or main electrical panel.
Clean the filter. If filters are dirty, it restricts water flow into the heater. Most heaters have a pressure switch that will not allow the heater to turn on ...
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 ...
Pool/spa is dirty; filter is not cleaning.
Clean the filter. If the filter is dirty, it will cause an increase in pressure that prevents the filter from working properly. Cartridge filters need cleaning ...
Pool pump is not circulating.
The pump may have stopped circulating because the water level in the pool/spa is too low. If the water level has dropped below the center of the skimmer, air may ...