OEM Lennox Dual Pressure Switch Assembly — 63W56
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 63W56 dual pressure switch assembly is an essential safety device in your Lennox gas furnace. Its two calibrated switches sense the vacuum generated by the inducer motor to verify correct venting and combustion airflow before the burners are permitted to light. This proving step protects against operation with a blocked flue or failed inducer.
Common failure symptoms: the furnace attempts to start then locks out, repeated ignition failures, control board pressure switch fault codes, an inducer that runs without ignition, or persistent short cycling. Clogged sensing hoses, a torn diaphragm, or an out-of-spec setpoint are frequent culprits.
Why OEM matters: Lennox calibrates the 63W56 to the precise pressure setpoints its furnaces require for safe sequencing. Non-OEM switches with mismatched thresholds create nuisance shutdowns or mask real venting hazards. The authentic Lennox assembly ensures accurate draft proving, dependable ignition, and the built-in safety performance your system was designed around.
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