Goodman GMSS920803BN Error Code 8 Flashes: Igniter Circuit Fault
What Does Code 8 Flashes Mean?
Eight flashes on the Goodman GMSS920803BN diagnostic LED indicate a problem with the igniter circuit. The control module has detected an electrical fault that prevents it from properly powering the hot surface igniter, so the furnace will not attempt to light.
The most common cause is a failed hot surface igniter. These are consumable components made of silicon carbide or silicon nitride that wear out over time. When the igniter develops a crack or break in its heating element, the circuit opens and the control module cannot send current through it. A typical igniter lasts 3 to 7 years depending on usage.
Other causes include loose or improperly connected igniter wiring, a poor ground connection at the unit or burner assembly, or a faulty control module. If the igniter was recently replaced, a loose wire connector is the most likely culprit. A technician can test the igniter's resistance and the circuit's continuity to pinpoint the failure.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- The furnace shows 8 flashes and will not ignite
- The igniter does not glow orange during startup
- A new igniter was installed but the code persists
✓ Verified against manufacturer service manual — March 2026