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The genuine OEM Lennox 87H93 pressure switch is a safety control that confirms the draft inducer is moving combustion air and venting properly before the furnace allows ignition. It senses negative pressure through a hose connected to the inducer or vent, then closes its contacts to signal the control board that it is safe to open the gas valve.
When the 87H93 fails or a venting problem exists, the furnace will typically fail to ignite, lock out, or short-cycle. Common symptoms include a blower and inducer that run without the burners lighting, repeated ignition attempts, and error codes indicating an open or stuck pressure switch. A blocked flue, cracked hose, or worn switch diaphragm can all trigger these faults.
Installing the OEM Lennox 87H93 ensures the switch is calibrated to the exact pressure setpoint your furnace requires. Aftermarket switches with the wrong trip point can allow unsafe operation or cause persistent nuisance lockouts. This factory-matched replacement restores correct, safe sequencing on your Lennox furnace.