Goodman GMEC960803BN Error Code Amber Rapid Flash: Low Flame Sense Current
What Does Code Amber Rapid Flash Mean?
Rapid amber flashes on the Goodman GMEC960803BN control board indicate low flame sense current. The flame sensor is a metal rod positioned in the burner flame that generates a tiny electrical current (measured in microamps) when it detects fire. When the current drops below the acceptable threshold, this warning code appears.
The furnace may still operate with this code, but the flame signal is weak enough that the control board is flagging it as a concern. If left unaddressed, the sensor will continue to degrade until the furnace can no longer detect the flame at all, leading to ignition failures and lockouts.
The most common cause is a buildup of oxidation, carbon, or silica residue on the flame sensor rod. This insulating layer reduces the sensor's ability to conduct the small electrical current needed for flame detection. Less commonly, the issue can be caused by improper gas pressure producing a weak flame, or poor electrical connections in the flame sense wiring.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Dirty or coated flame sensor rod | Most common | ✗ Call a pro → |
| Improper gas pressure | Common | ✗ Call a pro → |
| Poor flame sense wire or connections | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The low flame warning returns after cleaning the sensor
- The flame sensor rod appears cracked or physically damaged
- You suspect low gas pressure (other gas appliances are also performing poorly)
- The flame sense wire or connector shows damage or corrosion
- The furnace begins locking out with red 7 or red 8 flash codes
✓ Verified against manufacturer service manual — March 2026