OEM Lennox Limit Switch — 69W42
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The genuine OEM Lennox 69W42 limit switch is a temperature-sensing safety control that monitors the heat in your Lennox furnace's heat exchanger and plenum. If temperatures climb beyond safe limits — typically from restricted airflow — the switch opens to shut down the burners, protecting the heat exchanger and preventing a dangerous overheat condition.
Common failure symptoms: A faulty 69W42 can cause the furnace to short cycle on the limit, shut down unexpectedly during a heat call, fail to fire at all, or run the blower continuously. A switch that stays open blocks heating entirely, while one that fails closed removes vital overheat protection.
Why OEM matters: Limit switches are calibrated to open and close at precise temperature setpoints matched to your specific furnace model. The factory-original Lennox 69W42 guarantees the correct trip point, response, and mechanical fit — critical for a safety component. Generic switches with the wrong rating can nuisance-trip or, worse, fail to protect your equipment. OEM ensures your furnace shuts down exactly when it should.
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