626491R Nordyne Defrost Sensor Product Overview The 626491R Nordyne Defrost Sensor is a direct-fit thermistor designed to monitor coil temperatures in residential and light-commercial heat pump systems. It ensures reliable defrost cycle termination by accurately sensing when the outdoor coil has reached the required temperature threshold, helping to maintain system efficiency and prevent ice buildup. Technical Specifications Parameter Specification Sensor type NTC thermistor Resistance @ 32 °F (0 °C) 42 kΩ ± 5 % Resistance @ 77 °F (25 °C) 10 kΩ ± 5 % Operating temperature range –40 °F to 176 °F (–40 °C to 80 °C) Lead length 6 in (152 mm) Connector type 2-pin Molex-style quick-disconnect Cable insulation High-temperature PVC Sensor housing Epoxy-sealed thermistor core Cross-Reference Part Numbers Nordyne 626491R Neuco 626491R Coleman 626491R Nordyne 201073-02 Goodman DT400-377 Amana 40148001 Compatibility Nordyne/Coleman heat pump series N5, N6, P5, P6 York/Ducane split-system heat pumps Goodman/Amana GSZC and GMHP series American Standard 4A7A and 4A6A heat pumps Most other residential split-system heat pumps using remote defrost sensors Technician Notes Always shut off power and verify zero voltage before servicing. Install sensor in the original well or clip location on coil fins to ensure accurate temperature readings. Handle the thermistor leads gently—avoid kinks or sharp bends that can damage the sensor. Measure resistance at ambient temperature to confirm sensor integrity before wiring. Route and secure wiring away from moving components and high-voltage lines. Keep a spare 626491R in your service kit for rapid defrost troubleshooting.
