Trane CNT1045 Limit Switch

For service technicians managing overheating issues in larger residential or commercial air handlers, the Trane CNT1045 serves as a high-precision 180F CO limit switch designed for critical safety intervention. This HVAC high limit control features a 22-inch insert probe, making it ideal for deep-plenum applications where accurate core temperature sensing is required to prevent heat exchanger damage or unsafe operating conditions. As a genuine Trane OEM replacement part, it ensures direct electrical and physical compatibility with specific Trane and American Standard furnace models, including the YCD and YCH series. The switch operates on a normally closed circuit that opens at its 180-degree set point, providing localized protection against airflow restrictions or component failure. Utilizing this OEM furnace safety switch maintains the original equipment’s rigorous safety certifications and performance benchmarks during field repairs.

• Precise Thermal Protection: Factory-calibrated to open at 180°F, ensuring rapid response to over-temperature events.
• Extended Probe Depth: The 22-inch insertion length allows for deep reach into the air stream for more accurate temperature monitoring in large cabinets.
• OEM Reliablity: Direct replacement for part numbers CNT1045 and CNT01045, ensuring seamless integration with existing wiring harnesses.
• Broad Compatibility: Engineered for use in Trane and American Standard gas heating systems and commercial rooftops.

What causes this limit switch to trip frequently?
Repeated tripping is usually indicative of restricted airflow, often caused by a dirty air filter, blocked return ducts, or a failing blower motor. Ensure the system is operating within its rated static pressure before replacing the switch.

Is this switch compatible with 120V and 240V systems?
Yes, the Trane CNT1045 is designed to handle dual-voltage applications commonly found in residential and light commercial HVAC circuits.

Can I use a shorter insert if the 22-inch probe is unavailable?
It is not recommended. The 22-inch probe is specifically matched to the unit's cabinet depth to ensure the sensor is positioned in the optimal thermal path for safety monitoring.

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.