OEM Lennox Flame Rollout Switch — 99K63
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The genuine OEM Lennox 99K63 flame rollout switch is a critical safety device that detects flames or excessive heat escaping the burner compartment — a condition typically caused by a blocked heat exchanger, restricted venting, or a failing draft inducer. When abnormal heat is sensed, the switch instantly cuts power to the gas valve to prevent fire and equipment damage.
A tripped or failed rollout switch usually presents as a furnace that lights briefly then shuts down, no heat output, or a manual reset button that won't stay set. Because this switch guards against dangerous flame rollout, repeated trips should always be diagnosed by a qualified technician before replacement.
Using the OEM 99K63 is essential for safety: it is calibrated to the exact trip temperature Lennox specifies for your furnace model. Generic switches with incorrect temperature ratings can either nuisance-trip or, worse, fail to trip when needed. This factory part restores proper protection and guarantees a precise fit and reliable reset function.
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