Trane THT2436 Limit Switch

The Trane THT2436 is a mission-critical HVAC high limit switch designed for furnace temperature regulation and system safety. This OEM Trane replacement part serves as the direct successor for the legacy 1NT21L-2163 model. Engineered as an automatic reset limit switch with an SPST (single-pole, single-throw) configuration, the device is calibrated to open the circuit at 170°F and automatically re-close once temperatures drop back to 140°F. This precise 140-170F range ensures equipment protection by preventing thermal runaway in residential and light commercial air handlers and furnaces.

For service technicians, the Trane THT2436 limit switch features durable stainless steel terminals to maintain electrical continuity in high-vibration and high-heat environments. As a primary furnace safety control, it effectively monitors internal temperatures to avoid heat exchanger fatigue. This 140-170F limit switch is often found in Trane YCC series units (including YCC018 and YCC024 models) and is essential for clearing HVAC safety fault codes related to overheating. When a system trips on high limit, this manual reset alternative (automatic) provides a reliable, self-correcting safety mechanism once the unit cools to safe operating parameters.

Key Benefits

• OEM Precision: Genuine Trane THT2436 ensures exact mounting and terminal alignment for YCC and THT series air handlers.
• Direct Cross-Reference: Certified as the direct replacement for 1NT21L-2163, simplifying inventory for field contractors.
• Automatic Reset: Deactivates at 170 degrees Fahrenheit and resets at 140 degrees, eliminating the need for manual restarts after transient overheating.
• Corrosion Resistant: Built with stainless steel terminals to prevent oxidation and ensure stable connectivity.
• System Protection: Acts as a primary firewall against heat exchanger damage and furnace overheating.

Common Question: How do I know if the THT2436 is the correct replacement?

Check your existing switch for the part number 1NT21L-2163 or THT2436. This switch is typically used in Trane and American Standard furnaces where a high limit safety is required to open on rise at 170°F. If your furnace is cycling on and off or displaying a limit-related fault code, testing the continuity of this switch against the 140-170F threshold is a standard diagnostic step for HVAC professionals.

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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.