The Amana-Goodman B1340103 Auto Limit Switch is a critical HVAC safety control designed to monitor and regulate the internal temperature of gas furnaces and air conditioning systems. This genuine OEM replacement part features a specific L115-20F thermal profile, meaning it is engineered to open the electrical circuit at a 115°F high-limit threshold and automatically reset when the temperature drops by 20°F (to 95°F). As a veteran tech knows, maintaining precise furnace high-limit switch calibration is essential for preventing heat exchanger damage and ensuring the blower motor cycles correctly during the heating sequence. Constructed for long-term reliability in high-demand residential applications, the B1340103 limit switch is compatible with a wide range of Amana and Goodman upflow and horizontal furnace models. It utilizes standard 1/4 inch spade terminals for a secure, low-resistance connection to the integrated furnace control board. Whether you are troubleshooting a furnace short cycling issue or a blower that runs constantly without heat, replacing a drifted or failed automatic reset limit switch with this factory-specified component ensures the system operates within its engineered safety parameters. Key Benefits: Precision Thermal Calibration: Factory set at 115°F trip and 95°F reset to protect the heat exchanger from overheating. OEM Compatibility: Authentic Amana-Goodman replacement part ensuring exact fit and electrical matching for various furnace platforms. Automatic Reset Logic: Eliminates the need for manual intervention by restoring circuit continuity once safe operating temperatures are reached. Durable Construction: Built to withstand the rapid thermal cycling typical of high-efficiency residential HVAC systems. Common Questions: How do I know if my B1340103 limit switch is bad? If your furnace is short cycling or if the blower runs continuously while the burners fail to ignite, the switch may be stuck open or have drifted out of its 95-115F range. Is this switch a universal HVAC part? No. It is specifically calibrated for systems requiring an L115-20F limit. Using a switch with a higher temperature rating can create a fire hazard. Can I use this in an Amana air conditioner? Yes, this specific part number is utilized in both furnace safety circuits and certain air conditioning high-limit applications. 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.
