Lennox Error Code E200 indicates Hard lockout – flame rollout circuit open or previously open. Start by checking the most common and safe items identified in the troubleshooting section. If the code returns after those checks, professional diagnosis is recommended.
Professional Required
Hard lockout – flame rollout circuit open or previously open
Furnace shut down (hard lockout) until fault is cleared
Flame rollout circuit open or previously open
Correct cause of rollout trip or replace flame rollout switch; test furnace operation; clears after fault recovered
Flame rollout switch
Call an HVAC technician if the error persists after completing the recommended basic troubleshooting steps or if the system repeatedly locks out.
Disconnect power before inspecting the equipment. Never bypass safety devices or operate the system if you suspect unsafe conditions.
Learn more about the furnace components and operating conditions commonly associated with diagnostic error codes: