Lennox 32C89 Furnace Draft Inducer Pressure Switch OEM Replacement

The Lennox 32C89 is an OEM replacement pressure switch designed for use in Lennox gas furnaces. This critical safety component monitors the negative pressure generated by the draft inducer motor to verify that proper combustion airflow and venting are established before the furnace ignites.

The pressure switch contains an internal diaphragm that responds to changes in system pressure. When the inducer motor reaches the correct operating speed and draws sufficient vacuum through the venting system, the diaphragm flexes to close the switch contacts, signaling the control board to proceed with the ignition sequence. If the required pressure level is not detected — due to a blocked flue, failed inducer motor, or disconnected pressure tubing — the switch remains open, locking out ignition and preventing unsafe furnace operation.

Key Features:

• Genuine OEM Lennox replacement part (MPN: 32C89)
• SPST (Single Pole Single Throw) switching configuration
• Monitors draft inducer vacuum pressure for safe ignition sequencing
• Prevents furnace ignition if venting or airflow conditions are not met
• Direct drop-in replacement — no field modifications required
• Built to withstand the thermal environment inside the furnace cabinet

A faulty pressure switch is a common cause of furnace no-heat conditions, short-cycling, or ignition lockout errors. Replacing the 32C89 with a genuine Lennox OEM part ensures correct pressure setpoint calibration and compatibility with the furnace control board. Always verify fitment against your furnace model number before ordering.