Lennox 36K29 Limit Switch Refrigerant we know that a dirty

we know that a dirty flame sensor is the primary culprit behind furnace short cycling and ignition lockout codes

this model uses a single tip style (target type)

Operating at 208-230V and single-phase power

You must verify the model and serial number against the OEM parts list to ensure the burner manifold and mounting flange align with your current cabinet

Lennox 36K29 Limit Switch Refrigerant we know that a dirtyThe Lennox 36K29 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial gas furnaces. This furnace high limit switch features an auto reset function, calibrated to trip when plenum temperatures reach the 210 240F range. When an overheat condition is detected, the switch opens the electrical circuit to the gas valve, immediately terminating the heating cycle to protect the heat exchanger