Lennox Error Code E271 indicates Soft lockout – exceeded maximum number of retries; last retry failed due to pressure switch opening. 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
Soft lockout – exceeded maximum number of retries; last retry failed due to pressure switch opening
Unknown
Pressure switch opened during ignition retries
Check pressure of low pressure switch closing on heat call; measure operating pressure; inspect vent and combustion air inducer for correct operation and restriction; clears when heat call finishes successfully
Pressure switch, vent system, combustion air inducer
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: