Your SpaNet/Vortex touchpad will have four indicator LEDs on the left hand side. When it lights up RED, it means that it is working. When it is blue/off, it means that it is turned off.
AUTO light is lit red when the filtration Pump is in Automatic
Heater light is lit red when the heater or heat pump (if fitted) is operating
o3/UV light is lit red when the ozone or uv sanitizer is running (if fitted)
zZz light is lit red the sleep timer is on and the spa is in sleep mode.