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The genuine OEM Lennox 67K30 pressure switch is a combustion safety control that verifies adequate venting and draft before your Lennox furnace initiates ignition. It monitors the negative pressure produced by the draft inducer and closes its contacts only when proper airflow is confirmed, preventing the burners from firing under unsafe or blocked-vent conditions.
When this switch fails, the furnace typically will not start, locks out on a pressure fault, or short cycles. Telltale signs include the inducer motor spinning while the burners never light, recurring error codes, and a diaphragm that no longer opens or closes at the correct pressure. Blocked flues, kinked or clogged tubing, and age-related wear are common culprits.
The OEM Lennox 67K30 is calibrated to the precise trip pressure and built with the correct port and connector configuration your furnace requires. Substituting a generic switch with the wrong set point can trigger nuisance lockouts or compromise a critical safety function. This factory-authorized part restores dependable, safe operation.