York S1-025-30281-001 Temperature Sensor

The York S1-025-30281-001 Ambient Temperature Sensor is a high-precision 10K Ohm thermistor designed for integration with York heat pumps and packaged rooftop units. This OEM replacement sensor functions as a critical input for the control board, providing real-time ambient air data to optimize compressor staging and defrost cycles. It utilizes a Type III thermistor element, ensuring a predictable resistance-to-temperature curve across a broad operating range of -40°F to 185°F. Proactive replacement of a drifting or failed HVAC temperature sensor prevents common system faults, such as inaccurate discharge air readings or improper low-ambient operation. Constructed to withstand moisture infiltration at the wire leads, this ambient air sensor maintains linear signal output for reliable building automation synchronization. Field technicians prioritize this York HVAC part for its exact resistance specifications and direct-fit compatibility with existing wiring harnesses, eliminating the need for complex recalibration during service calls.

• Precision 10K Resistance: Calibrated as a 10K Ohm Type III thermistor for exact communication with York control boards.
• Environmental Protection: Engineered to resist moisture-induced corrosion at the connection points, a common cause of sensor drift.
• Optimized System Logic: Ensures accurate ambient data for efficient heat pump defrost cycles and outdoor air temperature monitoring.
• Direct OEM Fit: Drop-in replacement with standard 2-wire leads, reducing labor time during maintenance or troubleshooting.

How do I verify the S1-025-30281-001 is functioning correctly?
Disconnect the sensor and use a multimeter set to kilo-ohms. Measure the resistance across the leads and compare the value to a standard York 10K chart; at 77°F (25°C), the reading should be approximately 10,000 Ohms.

Will this sensor resolve "Ambient Sensor Fault" codes on my York unit?
If the control board displays a sensor failure code, this OEM part typically restores the signal. Ensure the wiring path is free of nicks or crushed segments that could alter resistance readings before finalizing the install.

Where is the ambient sensor typically located on a York package unit?
It is usually mounted behind the condenser coil or near the intake air section, secured with a mounting clip to sense true outdoor air temperature away from direct sunlight or internal component heat.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.