OEM Lennox Limit Switch — 69W36
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The genuine OEM Lennox 69W36 limit switch is a critical safety control that monitors the temperature inside your furnace's heat exchanger and plenum. When the air temperature climbs above the factory-set threshold, this switch interrupts the burner circuit to prevent overheating, protecting your heat exchanger and the surrounding equipment from thermal damage. It is engineered to the exact trip point and mounting specification your Lennox furnace requires.
A failing 69W36 limit switch often shows up as short cycling, where the furnace repeatedly shuts off before reaching the set temperature, or as a system that produces no heat at all because the switch has tripped open permanently. Nuisance lockouts, a blower that runs continuously, or intermittent no-heat calls are all common symptoms of a worn or drifting limit switch.
Because this is a safety-critical component, using a genuine OEM Lennox part matters. Aftermarket switches may trip at incorrect temperatures, leaving your system either unprotected or prone to false shutdowns. The factory 69W36 guarantees the correct calibration, terminal layout, and fit for reliable, safe furnace operation season after season.
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