OEM Lennox Flame Rollout Switch — 31J95

The genuine OEM Lennox 31J95 flame rollout switch is a temperature-sensing safety limit that protects your Lennox furnace from hazardous flame rollout. Positioned near the burner box, it monitors for excessive heat produced when flames escape the intended combustion path — commonly due to restricted venting, a compromised heat exchanger, or inadequate combustion air — and de-energizes the furnace to keep operation safe.

Common failure symptoms: When the 31J95 opens or fails, the furnace usually stops producing heat, shuts down mid-cycle, or fails to start. A switch tripped by a real fault stays open until the problem is resolved and the switch is reset, whereas a worn or defective switch can cause repeated nuisance lockouts even during normal firing.

Why OEM matters: This switch must trip at an exact temperature to safeguard your equipment and home. A generic replacement with the wrong rating may not respond correctly, risking either unsafe operation or unnecessary no-heat calls. The factory 31J95 matches Lennox's precise trip temperature and mounting design, delivering reliable protection and preserving your warranty. Choose genuine OEM for every safety-critical component.