Trane SWT1271 Limit Switch

The Trane SWT1271 is a critical furnace high limit switch designed for HVAC system diagnostics and thermal protection. As a standard OEM replacement part, this auto reset limit switch prevents the heat exchanger from reaching a hazardous open temperature of 180°F, cutting off power to the gas valve until the unit cools to its 150°F reset point. For technicians troubleshooting furnace short cycling or 4-flash error codes on a Trane or American Standard air handler, this SPST (Single Pole Single Throw) switch is a go-to heating system repair component. It features a surface mount design with quick-connect terminals for rapid installation in the supply plenum or blower section. With a current rating of 5.8 FLA at 120V AC, the SWT1271 ensures your residential HVAC services meet factory safety specifications, maintaining optimal airflow performance and preventing internal component fatigue.

• OEM Reliability: Genuine Trane component ensures precise 180°F open and 150°F close tolerances, crucial for HVAC troubleshooting.
• Automatic Reset: Eliminates the need for manual intervention by automatically restoring the circuit once safe temperatures are reached.
• Direct Compatibility: Replaces discontinued part numbers like SWT01271, ensuring a perfect fit for a wide range of Trane and American Standard furnaces.
• Heavy-Duty Contacts: Rated for 100,000 life cycles with a 34.8 LRA locked rotor current capacity.

• What causes this limit switch to trip frequently? Frequent tripping is usually a symptom of restricted airflow, often due to a clogged filter, blocked return vents, or a failing blower motor.
• How do I test if the SWT1271 is faulty? Use a multimeter to check for continuity across the terminals when the switch is cold; an open circuit during a cold state indicates the switch has failed and requires replacement.
• Is this switch compatible with my specific furnace model? While this part fits numerous Trane units, you should always verify the temperature stamps on your existing switch to ensure a match.

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.