Amana-Goodman B1370902S Limit Switch

The Amana-Goodman B1370902S Limit Switch is a critical OEM furnace safety control designed to regulate internal temperatures and provide over-temperature protection for Amana and Goodman HVAC units. This 180-210F Auto Limit Switch features a 3-inch insert and is engineered to open the electrical circuit if the plenum temperature exceeds the 210°F threshold, effectively preventing heat exchanger damage. As an automatic reset limit switch, it restores continuity once the temperature drops below the fixed differential (typically 180°F), ensuring the blower motor and heating cycle resume safe operation. Also identified as part number 1370902S, this genuine replacement limit switch is compatible with various packaged units and RTUs, such as the PGB series. For veteran technicians, this high-limit sensor offers a precise fit and reliable thermal response, eliminating common issues like furnace short cycling or blower runs constantly due to a tripped safety circuit. Maintaining original factory specifications is essential for system integrity and occupant safety in residential and commercial applications.

Key Benefits

• Genuine OEM Replacement: Fully compatible with Amana, Goodman, and Janitrol equipment to ensure exact B1370902S compatibility and performance.
• Broad Thermal Range: Precision calibrated for 180-210F temperature rating to protect the heat exchanger from overheating.
• Automatic Reset Logic: Features an auto-reset 180-210 degree switch mechanism that restores system function after cooling.
• Durable Construction: Built with a 3-inch insert limit switch probe for accurate airflow temperature sensing within the furnace plenum.
• Versatile Application: Frequently used to resolve air handler not heating or furnace high-limit trip errors.

Common Questions

What causes a B1370902S limit switch to trip?
A tripped furnace limit switch is usually caused by restricted airflow, often due to a dirty air filter, blocked return vents, or a failing blower motor, causing the heat exchanger to overheat.

Can I use B1370902S as a replacement for 1370902S?
Yes, the Amana-Goodman B1370902S is identical to the 1370902S and serves as a direct drop-in replacement for the same equipment models.

How do I test if this limit switch is bad?
Technicians should check for continuity across the terminals when the switch is cool. If the switch is open (no continuity) at room temperature, the high-limit safety control has failed and requires 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.