Furnace LED shows code 34; ignitor may glow but burners fail to light or light inconsistently.

Safety first: Turn off gas and power before working near burners or ignitor. Allow components to cool.

• Inspect ignitor condition: Remove the hot surface ignitor carefully. Look for hairline cracks or white, chalky buildup. Test continuity with a multimeter; an open ignitor must be replaced with the correct Bryant-rated part.
• Check ignitor alignment: Ensure the ignitor tip is positioned in the gas stream as specified by the manufacturer (usually directly in front of one burner port).
• Clean burners: Remove burner assembly if accessible. Use compressed air or a soft brush to clean dust and rust from burner ports. Do not enlarge the ports.
• Verify gas supply: Confirm gas shutoff valves are open and other gas appliances operate normally.

If the ignitor glows strongly but burners still do not light and code 34 persists, the gas valve or control timing may be at fault and should be tested by a technician.