Lennox OEM Parts

Furnace Pressure Switch Errors

Lennox furnaces — especially the SLP98, EL296, and ML296 series — are known for pressure switch issues. The most common cause isn't the switch itself: it's a clogged condensate drain trap. Lennox high-efficiency furnaces produce significant condensate, and the internal trap clogs with sediment. Clear the trap before replacing the switch. If the trap is clear, check the inducer motor and flue vent. Shop Lennox pressure switches →

Igniter Failure — Silicon Carbide vs Silicon Nitride

Older Lennox furnaces use silicon carbide igniters that are fragile and crack easily — often lasting only 2-3 years. Newer models use silicon nitride which lasts 5-7 years. If your Lennox igniter keeps failing, consider upgrading to the silicon nitride version (if available for your model). The igniter is a $25-$35 DIY replacement. Shop Lennox igniters →

Control Board Failure

Lennox uses proprietary control boards that are more expensive than most brands ($200-$400). The SureLight board (older models) and iComfort/S30 boards (newer) are common failure points. Symptoms include no response to thermostat, random shutdowns, or LED error codes. Power surges are the #1 cause — install a surge protector on your furnace circuit. Shop Lennox control boards →

Lennox Parts: Why They Cost More

Lennox uses more proprietary components than Carrier or Goodman, which means fewer universal alternatives. The tradeoff is tighter engineering tolerances and longer system life. Always use genuine OEM Lennox parts to maintain warranty coverage and system performance.