Whether you are troubleshooting a Trane heater fusible link failure or performing preventative maintenance on a furnace

The York S1-7710-3281 is a critical 105/85F fan limit switch engineered for precise thermal management within residential and light commercial air handlers and furnaces

High-Current Capacity: Maintains a 35-amp contact rating at 480 VAC

code-compliant installation directly to any standard electrical knockout

85" WC fixed set point

Lennox 20J91 Flame Sensor Whether you are troubleshooting aReplace your worn or fouled Lennox 20J91 with this authentic Lennox Flame Sensor to ensure reliable flame rectification and consistent ignition cycles. As a veteran grade OEM furnace replacement part, this sensor is engineered to provide precise microamp signal feedback to the furnace control board, preventing safety lockouts and intermittent heating failures. The 20J91 is functionally identical to the 20J9101 and serves as a direct fit component for