Amana-Goodman B1370920 Limit Switch

The Amana-Goodman B1370920 Limit Switch is a critical safety component designed for precise thermal regulation in residential gas furnaces. This 7-inch primary limit switch features an automatic reset function, calibrated with a trip threshold of 180°F to prevent heat exchanger damage or hazardous operating conditions. As a genuine OEM replacement part, the B1370920 ensures electrical compatibility with the existing integrated control module and provides an accurate response to high-limit temperature excursions. It is widely utilized in Goodman, Amana, and Janitrol furnace models, including the GMT and GUX series. When the internal plenum temperature reaches approximately 180°F, the switch opens the safety circuit, halting the combustion process while allowing the blower to dissipate residual heat. Once the temperature drops to the reset range of 150°F, the B1370920 furnace limit switch automatically closes, restoring the call for heat. Professional installation is recommended to ensure proper insertion depth and secure terminal connections in the furnace vestibule.

• OEM Precision: Guaranteed direct replacement for Amana and Goodman part B1370920, ensuring correct mounting and 7-inch sensor reach.
• Automatic Reset: Self-clearing 150-180°F range eliminates the need for manual resets after transient overheat events.
• System Protection: Rapidly de-energizes the gas valve if airflow is restricted, protecting the heat exchanger from thermal stress.
• Wide Compatibility: Fits a broad range of legacy and modern 80% and 90%+ AFUE furnaces.

• How do I know if my B1370920 limit switch is bad? If your furnace blower runs constantly while the burners fail to ignite, or if the system short cycles on high limit, use an ohmmeter to check for continuity across the terminals at room temperature.
• What causes this limit switch to trip frequently? Frequent tripping is usually a symptom of low airflow, often caused by a dirty air filter, blocked return grilles, an undersized duct system, or a failing blower motor.
• Can I use a different length limit switch? No. The 7-inch probe length is specific to the heat exchanger’s air stream. Using a shorter or longer probe can lead to inaccurate temperature sensing and unsafe operation.

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.

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