Lennox Error Codes

Lennox error codes verified against official Lennox support pages, owner's manuals and manufacturer service charts, by appliance.

• Lennox furnace error codes
• Lennox ac & heat pump error codes

All code pages

Lennox furnace E291 (heat airflow restricted below minimum) Lennox furnace E250 (limit switch circuit open) Lennox furnace E223 (low pressure switch failed open) Lennox furnace E270 (soft lockout: retries exceeded, no flame) Lennox furnace E312 (restricted airflow in cooling/fan mode (warning)) Lennox ac & heat pump E400 (compressor internal overload tripped) Lennox ac & heat pump E405 (compressor open circuit)