HARD LOCKOUT
Concord
Ignition Retry Limit Exceeded
Furnace LED indicates hard lockout (often rapid flashing or specific pattern); furnace will not attempt ignition until power is cycled.
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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
Repeated ignition failures, Flame loss during run multiple times, Faulty gas valve, Faulty ignition control board
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a furnace that is in hard lockout without identifying the cause. Turn off gas and power before inspection.
Steps:
- Power reset: Turn off power to the furnace for at least 30 seconds, then restore. Observe the ignition sequence carefully.
- Review prior faults: Note any flash codes that appear before lockout. These indicate the underlying issue (pressure switch, flame sense, etc.).
- Inspect ignition components: Check the hot surface ignitor, flame sensor, and gas valve wiring for damage or loose connections.
- Check gas supply: Ensure gas valve to the furnace is open and other gas appliances are functioning.
Recommendation: Persistent hard lockouts require professional diagnosis of combustion, gas pressure, and control board operation.
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Repair Difficulty
Professional Required
5/5
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