LED_7_FLASH
Lennox
Lockout Due to Repeated Ignition Failures
Status LED on Lennox furnace control board flashes 7 times; furnace may lock out after several failed ignition attempts.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Dirty burners, Weak gas supply, Faulty flame sensor, Faulty gas valve or control board
How to Fix / Troubleshooting
Safety: Turn off power and gas before servicing.
- 1. Clean flame sensor: As described earlier, clean and reinstall the flame sensor.
- 2. Inspect burners: Check for rust, debris, or misalignment and have them professionally cleaned if dirty.
- 3. Reset lockout: Turn power off for 30 seconds, then on. Observe ignition sequence.
If the 7-flash code returns, professional gas and combustion diagnostics are needed.
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Repair Difficulty
Hard
4/5
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