This specific Lennox limit switch is often identified as 56M1301

the housing must be pre-drilled according to the included technical instructions

maintaining high reliability in demanding electrical cabinets

the switch breaks the circuit to prevent equipment damage and ensure safe operation

protecting the heat exchanger and maintaining system integrity

Fenwal 35-725903-997 Remote Sensor R-410A This specific Lennox limit switchThe Fenwal 35 725903 997 Remote Sensor is a critical diagnostic and flame monitoring component designed for integration with Fenwal series ignition controls, specifically the Mark 10DX 117 and 35 72 series boards. Engineered for high temperature ionization sensing, this probe monitors flame conductivity to ensure safe and reliable furnace operation. Contractors typically deploy this surface mount flame sensor in commercial and residential HVACR