essential for multi-stage fan control and safety interlocks

Technicians typically check for a "Limit Switch Open" fault code

the 8406-037BX is technically identical to the 8406-037 in form

including the Lochinvar 402

This #47 brass burner orifice is specifically machined to meet rigid OEM tolerances for Reznor unit heaters and gas-fired equipment

York S1-025-38585-000 Limit Switch essential for multi-stage fan controlThe York S1 025 38585 000 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems. This automatic reset limit switch features a single pole single throw (SPST) configuration, engineered to open the electrical circuit at 55F and close at 45F. For veteran techs troubleshooting York, Coleman, or Luxaire units, this part acts as the primary defense against heat exchanger failure by monitoring temperatures