Lennox 12M92 Pressure Switch 320735-701 The Robertshaw 5300-023 is engineered

The Robertshaw 5300-023 is engineered with a 1/4" stem and includes a 4-way insert with an adjusting knob for straightforward mechanical calibration

the manual switch overrides the logic from the 24V controller

the internal relay or circuitry has likely failed

Full System Integration: Includes the Trane CNT7650 board

or ignition lockout

Lennox 12M92 Pressure Switch 320735-701 The Robertshaw 5300-023 is engineeredThe Lennox 12M92 Pressure Switch is a critical genuine OEM furnace safety component designed for specific Lennox gas furnaces and heating units. This combustion air pressure switch is factory calibrated to activate at 0. 70" WC (inches water column), ensuring the inducer motor is generating sufficient draft before the ignition sequence begins. As a furnace pressure switch replacement, the 12M92 monitors for venting obstructions or mechanical failures