Lennox Error Code E241 indicates Flame sensed out of sequence – flame still present. 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.
Easy
Flame sensed out of sequence – flame still present
Unknown
Gas valve leaking or flame still present when it should not be
Shut off gas; check for gas valve leak and replace if necessary; alert clears when fault recovered
Gas valve
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: