OEM Lennox Furnace Pressure Switch — 65W63
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The genuine OEM Lennox 65W63 pressure switch is a critical safety device that confirms proper draft from the inducer motor before your Lennox furnace is allowed to ignite. By sensing negative pressure in the venting system, it protects against blocked flues, cracked heat exchangers, and unsafe combustion conditions — a mandatory checkpoint in every heating cycle.
Common failure symptoms: When the 65W63 fails or clogs, the furnace typically won't fire, the inducer runs but ignition never begins, you see pressure-switch fault codes, or the unit short cycles. A stuck-open switch, cracked hose, or blocked port are the usual causes.
Why OEM matters: Pressure switches are calibrated to a specific trip point measured in inches of water column. Installing a switch with the wrong setpoint can defeat a life-safety function or cause chronic no-heat lockouts. The OEM 65W63 is matched to your Lennox model's exact draft specification, ensuring correct calibration, proper fit, and safe operation.
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