Lennox Error Code E211
Ignition Failure - Furnace Cannot Light
No Heat Emergency?
778-909-5731What Does E211 Mean?
Error code E211 indicates that your Lennox furnace attempted to ignite the gas burners but failed. The control board tried multiple ignition sequences without successfully establishing a flame.
This is a safety lockout to prevent gas from building up without ignition.
Common Causes of E211
- Dirty or Failed Ignitor: Hot surface ignitor not heating properly or cracked
- Gas Supply Issue: Gas valve closed, gas pressure too low, or gas line problem
- Flame Sensor Problem: Sensor too dirty or corroded to detect flame
- Failed Gas Valve: Gas valve not opening when commanded
- Control Board Issue: Failed ignition control module
Quick Checks You Can Do
Try these simple steps first
- Check gas supply: Verify gas valve to furnace is fully open
- Check other gas appliances: Do other gas appliances work? (water heater, stove)
- Reset the furnace: Turn off power for 30 seconds, then turn back on
- Check for error code changes: Does a different error appear after reset?
Professional Service Required
E211 errors typically require professional diagnosis and repair. Our technicians will:
- Test ignitor electrical current draw and visual inspection
- Measure gas supply pressure and test gas valve operation
- Clean or replace flame sensor
- Test control board ignition control circuits
- Verify proper venting and air supply
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