ActronAir Outdoor Ambient Temperature Sensor 6m 3-Pin JST monitors outdoor ambient temperature on Advance R32 and AIRES residential split ducted systems, providing the ambient temperature data the outdoor PCB uses to set operating limits, manage defrost frequency, and protect the compressor from low-ambient and high-ambient operating extremes. Accurate outdoor ambient sensing is critical for Advance R32 systems rated for operation at low ambient temperatures -- a faulty sensor causes premature low-ambient lockout or missed protection during extreme heat events. Isolate power at mains before replacing outdoor temperature sensing components.