York S1-025-28670-002 Limit Switch

The York S1-025-28670-002 Limit Switch is a critical safety component designed for precise thermal monitoring within residential gas furnaces and air handlers. This high limit control features fixed set points, engineered to break the electrical circuit to the gas valve if the heat exchanger temperature reaches the 120-degree opening temperature threshold. Once the plenum cools to the 80-degree closing temperature, the switch automatically resets, allowing the system to resume its normal sequence of operation. As a genuine York OEM replacement part, this bimetal disc sensor ensures exact calibration and timing, which is vital for protecting the heat exchanger from structural damage due to overheating. This HVAC safety control is a direct fit for many York, Luxaire, and Coleman units, providing a reliable solution for technicians addressing intermittent limit trips or failed sensors caused by restricted airflow or high static pressure. Utilizing professional-grade materials, it is built to withstand the rigors of high-cycle thermal environments without drifting from its factory specifications.

• Verified set points of 120°F Open and 80°F Close ensure the system operates within manufacturer-defined safety parameters.
• Direct Source 1 replacement ensures mounting hole alignment and terminal spade compatibility for fast field installation.
• Robust bimetal disc construction provides mechanical reliability and high-speed response to temperature fluctuations.
• Essential for troubleshooting furnace lockout codes related to primary limit circuit opens.

How do you test a York limit switch for failure? Use a multimeter to check for continuity across the terminals while the switch is at room temperature; it should be closed. If the circuit remains open when cool, the internal bimetal disc has failed.

What causes a York S1-025-28670-002 to trip? Frequent tripping is usually indicative of airflow issues, such as a clogged 4-inch pleated filter, a failing blower motor capacitor, or restricted secondary heat exchangers.

Is this switch compatible with Coleman and Luxaire furnaces? Yes, since York, Coleman, and Luxaire are brands under the same parent manufacture, this part is the standard 120-80 limit switch for several models across those product lines.

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.