Furnace attempts ignition but fails, LED shows code 14 (ignition lockout). Furnace may retry after an hour.

Safety first: Turn off power and gas before removing burner or gas components. Gas leaks and improper ignition can be dangerous.

• Inspect hot surface ignitor: Locate the silicon carbide or silicon nitride ignitor near the burners. Do not touch the element with bare fingers. Look for cracks, white spots, or breaks. If damaged, replace with the exact Carrier-rated ignitor.
• Check burner area: Remove the burner access panel. Look for rust, debris, or spider webs in the burner inlets and crossover ports. Clean gently with a soft brush and vacuum.
• Verify gas shutoff valves: Ensure the manual gas shutoff valve near the furnace is parallel to the pipe (open). Check that any appliance shutoff on the gas valve is in the ON position.
• Observe ignition sequence: Restore power and gas, then call for heat. Watch through the sight glass: inducer starts, ignitor glows, then gas should flow and burners light smoothly. If the ignitor glows but burners do not light, the gas valve or gas supply may be at fault.

If you smell gas, hear loud booms on ignition, or the furnace repeatedly locks out, shut it down and call a qualified technician immediately.