Lennox Error Code E270 indicates Soft lockout – exceeded maximum number of retries (no flame current sensed). 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 (no flame current sensed)
Unknown
No flame current detected after maximum number of ignition retries
Check proper gas flow; ensure ignitor is lighting burner; check flame sensor current; clears when heat call finishes successfully
Gas supply, ignitor, flame sensor
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: