ActronAir Ambient/Return Air Temperature Sensor 6m 3-Pin JST monitors ambient or return air temperature on ESP Plus, AIRES, and Advance R32 residential split ducted systems, providing the return air temperature data the indoor PCB uses to calculate coil approach temperature, manage capacity, and protect against low-ambient heating conditions. The 6-metre 3-pin JST cable provides sufficient reach for return air grille sensing positions in large ceiling cavities where the indoor unit is mounted at significant distance from the return air path. Isolate power at mains before replacing temperature sensing components.