ActronAir Coil Temperature Sensor 6m is an extended-length NTC coil temperature sensor for large residential and commercial ActronAir ducted systems, monitoring coil temperature across a 6-metre cable run for defrost management and coil protection on outdoor units where the PCB and coil sensing point are widely separated. Confirm the connector type and thermistor specification against the system's service documentation before ordering -- multiple 6-metre coil sensors exist with different connector types for different system generations. Isolate power at mains before replacing any coil temperature sensors.