Optical Sensor & Thermistor that gives Water & Prime errors on SpaNET and Vortex spa SV control systems. This is a common point for leaks. Often due to low pH or other water issues. May be source of ER-2, ER-3, ER-5, ER-6 or temperature reading of 99.9°

Heater Sensor assembly complete with clear plastic housing and o-ring to suit SV series heater tubes (v1 & v2 models)

SV Series: (square plug)

Suits SV2, SV3, SV4

These items cannot be returned once fitted. We recommend replacing entire heater where these have leaked.