Lennox error codes

1 documented code with ranked causes, repair costs, and step-by-step guidance.

Lennox Furnace — Code 200 (ignition lockout) Lennox Furnace Code 200: Causes, Fixes & Costs Lennox furnace showing code 200 ignition lockout with no heat? What it means, causes ranked, the flame-sensor fix, safe checks, and real repair costs.