Reznor 106845 Limit Switch

The Reznor 106845 Limit Switch is a mission-critical OEM Reznor replacement part designed for high-temperature safety across a broad range of Reznor HVAC equipment. This 350°F high limit switch acts as a primary safety control, monitoring internal heat levels to prevent system damage. Featuring a specialized CO AUTO functionality, this automatic reset limit switch is engineered to open the electrical circuit if the temperature exceeds the 350°F threshold, effectively shutting down the unit before catastrophic overheating occurs. Once the equipment returns to a safe operating temperature, the switch automatically resets, allowing the system to resume normal operation without manual intervention.

For service technicians and contractors, the 106845 limit switch is often required when troubleshooting Reznor unit heater maintenance or addressing frequent limit trips caused by airflow restrictions. It is directly compatible with several industrial and commercial units, including the Reznor RA, RAD, and RV series (specifically models 110, 140, 235, 325, and 500). Utilizing genuine Reznor heating safety controls ensures the thermal protection of the heat exchanger and maintains the precision performance required in heavy-duty heating applications.

Key Benefits

• Precise Overheat Protection: Calibrated for a 350°F trip point to protect critical furnace components and heat exchangers.
• Automatic Reset Design: Eliminates service calls for manual resets by restoring the circuit once the unit reaches safe thermal levels.
• OEM Compatibility: Guaranteed fit for Reznor unit heaters, ensuring electrical and mounting specifications match factory standards.
• Rugged Construction: Built with high-grade materials to withstand the thermal cycling common in industrial HVAC high-temperature safety applications.

Common Questions

What does the "CO AUTO" designation mean for this switch?
"CO" stands for Cut-Out, and "AUTO" refers to the automatic reset function. This means the switch will cut the power at its rated temperature (350°F) and automatically re-close the circuit once it has cooled down sufficiently.

Why is my Reznor limit switch frequently tripping?
Repeated tripping typically points to airflow issues such as a dirty air filter, a failing blower motor, or obstructed ductwork. After verifying airflow, if the switch fails to reset or trips prematurely, it likely requires replacement with a 106845 OEM switch.

Is this compatible with Reznor waste oil heaters?
Yes, the 106845 is a standard high limit safety control for several Reznor waste oil units and industrial gas-fired heaters. Always verify the temperature rating stamped on your existing switch before installation.

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.