ClimateMaster S17S0030N01 Thermistor

The ClimateMaster S17S0030N01 AirFreeze Thermistor is a critical 10K Ohm NTC sensor designed for high-precision temperature monitoring in water source heat pumps and geothermal HVAC systems. This genuine OEM replacement thermistor features a 36-inch gray lead, identifying it specifically as the FP1 (Freeze Protection 1) sensor. Its primary function is to safeguard the coaxial heat exchanger by detecting low-limit temperature conditions that could lead to coil freezing during heating cycles. Field technicians utilize this sensor to prevent nuisance lock-outs and "Code 4" faults, ensuring the system maintains thermal equilibrium even in demanding geothermal applications.

Engineered for seamless integration with CXM and DXM control boards, the S17S0030N01 provides real-time resistance feedback, allowing the microprocessor to adjust flow rates or trigger safety shutdowns as required. This unit is the direct factory-authorized successor to legacy ClimateMaster parts including 17B0027N06 and 17B0005N06. By maintaining accurate calibration, this thermistor optimizes energy efficiency and prevents predictive maintenance issues common in geothermal heat pump maintenance. For contractors servicing Tranquility series units, this gray-wire thermistor is the specific component required for water-side freeze protection, distinct from the violet-wire FP2 air-coil sensors.

• Direct OEM Compatibility: Replaces 17B0027N06 and 17B0005N06 without requiring field modifications to the 12-pin wiring harness.
• Precision Freeze Protection: Calibrated 10K resistance curve provides accurate low-temperature detection to avoid catastrophic coil damage.
• Durable 36-Inch Leads: The 36" gray wire lead offers sufficient length for routing through insulated cabinets to the refrigerant line.
• System Reliability: Eliminates false "Code 4" low-water temperature faults caused by drifted or out-of-calibration legacy sensors.

Common Questions

How do I identify if I need the gray or violet thermistor?
In ClimateMaster diagnostics, gray wires (S17S0030N01) are for the FP1 water coil sensor, while violet wires are for the FP2 air coil sensor. Always verify the lead color and the specific fault code (Code 4 vs. Code 5) before ordering.

Will this sensor fix a consistent Code 4 lockout on my DXM board?
If your resistance-to-temperature readings are out of spec according to the nominal resistance table, replacing a drifted thermistor often resolves nuisance lockouts. However, always verify water flow and antifreeze concentrations first.

Does this kit include the mounting clip for the refrigerant line?
This kit is the thermistor and lead assembly. Technicians should inspect the existing insulation and mounting clips on the copper line to ensure proper thermal contact for the new sensor.

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.