and VR4305 series

Inspect the gasket during every annual boiler service

Substituting a different rating can prevent the furnace from firing or allow it to operate under unsafe venting conditions

Compatible with Nest

making it suitable for both control circuits and direct motor loads

York S1-025-38584-000 Defrost Sensor and VR4305 seriesThe York S1 025 38584 000 Defrost Sensor is a critical thermistor component designed for precise ambient temperature sensing in York, Luxaire, and Coleman heat pump systems. This HVAC replacement sensor monitors outdoor coil conditions to provide accurate resistance data to the integrated defrost control board, ensuring the system initiates defrost cycles only when necessary. Constructed with a high reliability thermistor bead, the S1 025 38584 000