Furnace attempts ignition but locks out; LED shows code 14 (ignition lockout).

Safety first: Turn off power and gas before removing burner compartment doors. Do not attempt to adjust gas pressure yourself.

• Reset power: Turn off furnace power for 30 seconds, then restore. This clears soft lockout. Call for heat and observe the sequence.
• Inspect hot surface ignitor: With power off, locate the ignitor near the burners. Check for cracks or white spots on the silicon carbide element. Do not touch the element with bare fingers. If cracked or open (no continuity), it must be replaced.
• Clean flame sensor: Remove the flame sensor (small rod in front of a burner) with a nut driver. Gently clean the rod with fine steel wool or emery cloth until shiny. Reinstall and ensure the wire connection is tight.
• Check gas supply: Confirm the manual gas shutoff valve near the furnace is parallel to the pipe (ON). Make sure other gas appliances in the home work normally.

If the ignitor glows but burners never light, or burners light then shut off within a few seconds and code 14 returns, the gas valve or control board may be faulty and should be tested by a technician.