OEM Lennox Furnace Ignitor R100220-01 — 98M85

The genuine OEM Lennox 98M85, also identified by manufacturer number R100220-01, is a hot surface ignitor that lights the gas burners in your Lennox furnace. On each heat call, the furnace control energizes the ignitor, which heats until it glows and ignites the incoming gas. This part is a direct factory replacement, matched to the exact resistance and mounting geometry your Lennox unit requires for safe, reliable ignition.

Common failure symptoms: When the 98M85 wears out, the furnace often runs its ignition sequence but never lights, produces no warm air, or locks out after multiple failed attempts. You may also see a cracked ignitor element or notice no visible glow during a heat call — clear signs the ignitor needs replacement.

Why OEM matters: An ignitor's glow temperature and resistance must match the furnace's control timing precisely. The genuine Lennox 98M85 / R100220-01 delivers factory-spec performance and fitment, avoiding the nuisance lockouts and premature cracking common with generic replacements. Installing OEM protects the ignition sequence and helps your Lennox furnace start dependably through every heating season.