Reznor 196950 Limit Switch

When you are troubleshooting a Reznor unit heater that keeps tripping on its thermal link, the Reznor 196950 Limit Switch is the 250F manual reset safety component you need to restore reliable operation. This OEM replacement part is engineered specifically for Reznor UDAP and UDAS series gas-fired unit heaters, providing critical protection against heat exchanger overheating. As a Manual Reset Limit Switch, it is designed to intentionally break the burner circuit once the 250°F temperature threshold is reached, requiring a technician to physically inspect the unit and reset the switch before the system can fire again. This yellow-dot coded Flame Rollout Switch is a standard security measure in models ranging from 100 to 125 size, ensuring that high-limit events caused by restricted airflow or venting issues are addressed immediately. Utilizing genuine Reznor heating parts like the 196950 ensures that your industrial or commercial heating equipment maintains its factory-spec safety sequence without the risk of incompatible thermal curves found in generic alternatives.

• System Safety: Operates as a High Limit Switch to prevent heat exchanger damage by opening the circuit at 250 degrees Fahrenheit.
• Manual Reset Feature: Ensures mandatory system inspection after an overheat event to prevent cycling on a localized fault.
• Precise Compatibility: Direct fit for Reznor UDAP100, UDAP125, UDAS100, and UDAS125 unit heaters.
• OEM Reliability: Manufactured by Nortek Global HVAC to original specifications for consistent thermal response and long-term durability.
• Easy Traceability: Distinct yellow dot marking allows for quick visual identification of the temperature rating during field service.

What causes this switch to trip on a Reznor unit?
Common culprits include a dirty air filter, a failing blower motor, or restricted ductwork, all of which reduce airflow over the heat exchanger and drive up internal temperatures.

Can I bypass this limit switch for testing?
Bypassing a 250F Limit Switch is dangerous and should never be done during normal operation. If the switch is open, it implies an unsafe condition that must be diagnosed by a professional HVAC technician.

How do I know if the 196950 needs to be replaced?
If you have continuity across the terminals while the unit is cool, but the switch fails to reset after a trip, or if it shows a visual burnout, it is time for a replacement.

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.