What This Error Means

The furnace control detected a failure in the igniter circuit. The official fault category includes an igniter relay failure or an electrically open igniter.

Symptoms You May Notice

Inducer runs but igniter does not glow; burners do not light; repeated ignition attempts; furnace locks out; igniter may show visible cracking.

Common Causes

Open or cracked hot-surface igniter; loose igniter connector; broken wire; failed control-board igniter relay; incorrect supply voltage; damaged board trace.

Safe Troubleshooting Steps

1. Turn off power. 2. Allow the igniter to cool and avoid touching its element. 3. Inspect it for cracks or white burn marks. 4. Inspect the plug and wiring. 5. A technician should test igniter resistance according to the component specification. 6. During a controlled call for heat, verify the correct voltage reaches the igniter. 7. Replace an open igniter or diagnose the furnace-control relay when output voltage is absent.

Parts Commonly Involved

Hot-surface igniter; igniter connector and wiring; integrated furnace control; igniter relay; transformer and line-voltage supply.

When to Call a Technician

Recommended. Igniter replacement may be straightforward, but relay and live-voltage diagnosis require professional testing.

Safety Notice

Disconnect electrical power before handling the igniter. Hot-surface igniters are fragile and operate at very high temperatures.

Manufacturer Documentation