White-Rodgers 3L02-180 Limit Switch

The White-Rodgers 3L02-180 is a high-limit snap disc manual reset limit switch designed for critical thermal protection in HVAC applications. This fixed temperature control features a 180-degree F cut-out point, utilizing an open on rise switch action to break the electrical circuit when the system exceeds safe operating parameters. As a 60T15 series equivalent (specifically model 60T15-330536), it provides essential safety for furnaces and air handlers, preventing overheating and potential heat exchanger damage. The manual reset configuration is vital for technicians, as it requires a physical inspection of the equipment before the system can be restarted, ensuring the underlying cause of the high-limit trip is addressed. This 3/4-inch disc is constructed for high-load switching and is a common service part for many residential and commercial heating units.

• Precise Thermal Cut-Out: Calibrated for a 180°F fixed trip point to ensure system safety.
• Manual Reset Mechanism: Prevent automatic cycling during unsafe conditions, requiring technician verification.
• Universal Compatibility: Replaces White-Rodgers 3L02-180 and 60T15-330536 across various OEM platforms.
• Heavy Duty Construction: Engineered for high-limit safety reliability in demanding furnace environments.
• Compact Form Factor: Standard 3/4-inch snap disc design allows for quick installation in existing mounting brackets.

If the limit switch is stuck in the open position, the furnace blower may run continuously while the burners fail to ignite. Check for continuity across the terminals; no continuity at room temperature indicates a failed switch.

Bypassing a 180-degree limit switch is never recommended outside of momentary diagnostic testing by a qualified technician. If the switch keeps tripping, there is likely an airflow issue, such as a clogged filter or failing blower motor.

While this is a common HVAC replacement part, you must verify the specific temperature rating and reset type. Using a manual reset switch where an auto-reset is required—or vice versa—can lead to system malfunction or safety hazards.

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.