ActronAir Sensor Kit is a factory-matched sensor replacement kit for ActronAir residential split ducted systems, supplying a matched set of NTC thermistor sensors for simultaneous replacement when a sensor fault code cannot be definitively attributed to a single sensor after individual testing. Replacing sensors as a matched kit from a single manufacturing batch ensures consistent thermistor characteristics across all sensing positions, which is critical for systems that use differential temperature calculations such as superheat and approach temperature monitoring. Isolate power at mains before replacing any temperature sensing components.