Status LED flashes seven times, furnace may lock out, blower may run continuously.
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.
Possible Causes
How to Fix / Troubleshooting
Safety First: Turn off power and gas before removing burner assembly or gas valve connections.
This code indicates the flame was established but then lost during the heating cycle.
- Inspect burners: Remove the burner assembly if accessible. Clean rust, scale, and debris from burner ports with a wire brush and compressed air. Ensure proper alignment when reinstalling.
- Clean flame sensor: Remove and clean the flame sensor rod with fine steel wool. Ensure it is properly positioned in the burner flame.
- Check gas supply: Confirm the manual gas shutoff is fully open. If other gas appliances show issues, contact the gas utility.
- Observe flame: Through the sight glass, verify the flame is steady and blue with minimal yellow tipping. If the flame lifts off the burner or blows out when the blower starts, there may be a combustion air or pressure issue.
When to call a professional: If flame continues to drop out, a technician should check manifold pressure, gas valve operation, and combustion air supply.