OEM Lennox Dual Pressure Switch — 29W64
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The genuine OEM Lennox 29W64 dual pressure switch is a safety control that confirms proper venting and combustion airflow before your furnace lights. It monitors the negative pressure created by the inducer motor across two stages, proving the flue is clear and allowing the ignition sequence to proceed only when it is safe to do so in compatible Lennox furnaces.
Common failure symptoms: A failed 29W64 commonly causes the furnace to lock out or refuse to ignite, the inducer motor to run without the burners firing, pressure-switch or venting error codes, and repeated failed ignition attempts. Stuck-open or stuck-closed contacts, cracked diaphragms, and blocked pressure ports are typical causes of failure.
Why OEM matters: Pressure switches are calibrated to specific actuation set points measured in inches of water column. The authentic OEM 29W64 is factory-set to the exact Lennox specifications for both stages, ensuring accurate draft verification and full safety compliance. Aftermarket switches with incorrect trip pressures can cause nuisance lockouts or bypass essential venting checks. Choose the genuine Lennox part for safe, reliable ignition.
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