OEM Lennox Pressure Switch — 58H31

The genuine OEM Lennox 58H31 pressure switch is a furnace safety device that confirms adequate combustion airflow and proper venting before ignition is permitted. As the inducer motor draws air through the heat exchanger, this switch senses the resulting negative pressure and closes its contacts to signal the control board that the system is safe to fire. Built to Lennox specifications, the 58H31 delivers the exact pressure set point your furnace was designed around.

Common failure symptoms: A failing pressure switch often produces a furnace that will not ignite, ignites and immediately drops out, short cycles, or triggers a pressure switch error code on the control board. Cracked hoses, a clogged vent, water in the switch port, or a fatigued diaphragm can all prevent the switch from closing correctly.

Why OEM matters: Because the 58H31 is calibrated to a specific inches-of-water-column threshold unique to your Lennox model, using the genuine part guarantees the safety circuit trips at the intended pressure. Generic replacements with mismatched set points risk nuisance lockouts or unsafe operation. The OEM switch installs with a factory-perfect fit, protects your heat exchanger and combustion process, and keeps your Lennox warranty intact.