OEM Lennox Flame Rollout Switch — 57W76

The genuine OEM Lennox 57W76 flame rollout switch is a manual-reset safety limit that protects your furnace and home from dangerous flame rollout conditions. Mounted near the burner assembly, it senses excessive heat that occurs when flames escape the combustion chamber — typically due to a blocked heat exchanger, restricted venting, or inadequate combustion air — and instantly cuts power to the gas valve to shut the furnace down. This exact-fit component meets Lennox's precise temperature trip rating for dependable protection.

Common failure symptoms: A tripped or failed rollout switch results in no heat and a furnace that locks out. If the switch trips repeatedly, it is usually signaling an underlying problem such as a cracked heat exchanger, dirty burners, or a venting blockage that should be inspected. A switch that has been overheated may also fail open permanently and require replacement.

Why OEM matters: Flame rollout switches are calibrated to open at a specific temperature matched to your Lennox furnace's design. The genuine 57W76 guarantees the correct trip point and mounting fit, ensuring this life-safety device responds exactly as engineered. Substituting a non-OEM switch with a different rating can compromise safety or cause nuisance shutdowns. Always use the factory part for critical safety controls to protect your household and maintain warranty coverage.