Trane SWT2173 Rollout Switch

As a veteran tech, you know that a tripped rollout is never the root cause—it is the safeguard. The Trane SWT2173 Rollout Switch (SKU: SWT02173) is a critical OEM furnace safety component designed to break the 24V control circuit when it detects flame rollout or excessive heat at the burner box. Rated for L310 degrees F, this manual reset rollout switch is a direct replacement for Trane and American Standard furnaces, including popular residential series like the Trane XB80 (TUE080A936L0) and TUE120A960K3 models.

When you are troubleshooting a furnace rollout switch open error code, this genuine part ensures the high-limit protection is restored to factory specifications. This switch replaces several older part numbers, including SWT01978 and SWT01989, making it a versatile addition to your service truck's inventory. Its L310F thermal limit is precisely calibrated for single-stage and multi-stage gas heating units to prevent heat exchanger damage or hazardous combustion conditions. Always verify the flame rollout switch location and inspect the heat exchanger for cracks or flue obstructions before resetting this thermal safety switch.

• Direct OEM Match: Ensures exact fit and L310°F trip point for Trane SWT2173 and SWT02173 applications.
• Enhanced Reliability: Genuine Trane replacement part prevents nuisance tripping while maintaining strict safety overhead.
• Wide Compatibility: Backwards compatible with multiple American Standard rollout switch part numbers.
• Manual Reset Mechanism: Requires a physical inspection of the burner assembly before system restoration, complying with safety protocols.

What causes a Trane SWT2173 to trip?
Usually, it is a sign of restricted airflow through the heat exchanger, a clogged flue, or high manifold gas pressure causing the flames to "roll out" of the combustion chamber.

Can this replace a switch with a lower temperature rating?
No. Always match the "L" rating (e.g., L310F) specified by the manufacturer. Installing a different temperature limit can compromise system safety or cause premature failures.

How do I test the SWT2173?
With the power off, use a multimeter to check for continuity across the terminals. If the button is pressed and you have an open circuit, the internal bimetal disc or fuse has failed and the unit needs 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.