OEM Lennox Limit Switch — 87F16
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The genuine OEM Lennox 87F16 limit switch is a temperature-sensing safety device that guards your Lennox furnace against overheating. Mounted near the heat exchanger, it continuously senses supply-air temperature and opens the burner circuit the moment conditions exceed the safe limit. This protects the heat exchanger from cracking and keeps combustion operating within Lennox's design parameters.
Common failure symptoms: A failing 87F16 often causes the furnace to short-cycle, produce little or no heat, or trip repeatedly on the limit even when airflow is normal. You may also see the blower running nonstop as the control tries to shed heat. Contacts that stick open or closed are a clear sign the switch needs replacement.
Why OEM matters: Limit switches are calibrated to a precise trip temperature, and a generic substitute rarely matches Lennox's specification. Installing the OEM 87F16 ensures the switch opens and resets at the correct thresholds, seats properly in the original bracket, and integrates cleanly with your furnace's safety sequence — preserving both performance and your equipment warranty.
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