OEM Lennox Dual Pressure Switch Assembly — 63W57
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The genuine OEM Lennox 63W57 dual pressure switch assembly is a key safety control in your Lennox gas furnace. Using two calibrated diaphragm switches, it monitors the negative pressure created by the inducer blower to confirm proper venting and adequate combustion airflow before allowing the burners to ignite. If safe draft isn't verified, the switch prevents ignition to protect your home.
Common failure symptoms: furnace that ignites then shuts down, repeated lockouts, blank or error codes on the control board, no ignition despite a running inducer, or short cycling. Blocked hoses, a stuck diaphragm, or a drifting setpoint can all cause a bad switch to falsely open or close.
Why OEM matters: the 63W57 is factory-calibrated to the exact pressure thresholds your Lennox furnace expects. Aftermarket switches with incorrect setpoints cause nuisance trips or, worse, fail to detect a genuine venting problem. Installing the authentic Lennox part guarantees accurate pressure sensing, reliable ignition sequencing, and the safety protection your furnace was engineered to provide.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days