Trane THT2435 Limit Switch

The Trane THT2435 is a critical OEM replacement thermal safety component engineered for precision temperature monitoring in high-performance furnaces and air handlers. Designed with a 7-inch insertion length, this automatic reset limit switch ensures superior coverage within the heat exchanger airflow. It is calibrated to professional standards, featuring a fixed setpoint that opens at 150°F to interrupt the electrical circuit during over-temperature events and automatically closes at 120°F once safe operating conditions are restored. This sensor is the direct aftermarket replacement for discontinued part numbers THT1220 and 1NT21L-2162, providing a seamless drop-in fit for technicians servicing legacy Trane and American Standard equipment. Built with stainless steel terminals for maximum corrosion resistance and consistent conductivity, the THT2435 limit switch is the primary defense against internal component damage caused by restricted airflow or blower failure. For contractors managing residential or light commercial split systems, verifying the L150-30 temperature differential is essential for maintaining system safety and equipment longevity.

• Direct OEM Compatibility: Verified replacement for THT1220 and 1NT21L-2162 ensures exact physical and electrical matching.
• Precision Thermal Response: The 150°F open / 120°F close cycle provides reliable over-temperature protection without manual intervention.
• Optimized Sensing: Features a 7-inch sensor insertion probe to accurately sample internal air temperatures across the plenum.
• Rugged Construction: Equipped with industrial-grade stainless steel terminals to withstand high-heat environments and prevent contact oxidation.

• How do I know if the THT2435 is tripped? If the furnace inducer runs but the burners fail to ignite, or if the system displays a "limit circuit open" fault code, use a multimeter to check for continuity across the terminals.
• Will this switch fit my specific furnace model? This 7-inch probe is designed for specific furnace depths. Always verify the insertion length of the existing faulty switch to ensure the sensor reaches the optimal thermal zone.
• Can I use a manual reset switch instead? No. The Trane THT2435 is an automatic reset type. Substituting a manual reset switch can lead to nuisance lockouts and may not meet the original equipment’s safety sequence.

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.