Lennox Furnace Error Code E290: How to Fix It

Q: What causes a Lennox furnace E290 error code?

E290 errors are typically caused by a failed hot surface igniter, dirty flame sensor, gas supply issues, blocked vents, or faulty gas valve. The furnace locks out after 4 failed ignition attempts for safety.

Q: How do I reset my Lennox furnace after E290 error?

Turn off the furnace at your thermostat, wait 30 seconds, then turn it back on. This should clear the lockout. If E290 returns immediately, there's an underlying issue that needs fixing before the reset will work.

Q: Is it safe to keep trying to restart my furnace with E290 error?

No, repeatedly trying to restart can be dangerous. The lockout exists for safety reasons. If the furnace won't stay running after one reset attempt, stop and troubleshoot the underlying cause or call a professional.

Q: How much does it cost to fix a Lennox E290 error?

Costs vary depending on the cause. A dirty flame sensor cleaning might cost $100-150, while igniter replacement typically runs $200-350. Gas valve replacement can cost $400-600 including labor.

Q: Can I replace a Lennox furnace igniter myself?

While technically possible, igniter replacement involves working with gas and electrical systems. Most homeowners should hire a qualified HVAC technician for safety and to maintain warranty coverage.

Abstract

Error code E290 on your Lennox furnace means the ignition system has failed four times and is now locked out for safety. This critical error prevents your furnace from starting and requires immediate attention to restore heat to your home.