Goodman GMEC960803BN Error Code Red LED Solid On: Internal Fault / GV Error / Micro / Frequency Check
What Does Code Red LED Solid On Mean?
A solid red LED on the Goodman GMEC960803BN control board indicates an internal control board fault. The board has detected a critical error in its own hardware or microprocessor — this can include gas valve circuit errors, microprocessor failures, or frequency check anomalies.
Unlike most other fault codes that point to external components (pressure switches, limit switches, igniters), a solid red LED means the control board itself has failed. The board can no longer reliably manage the furnace's safety and operating sequences, so it shuts down all operations.
This is not a field-repairable condition. Power cycling the furnace may temporarily clear the code, but if the board has a genuine internal fault, the error will return. The control board must be replaced by a qualified HVAC technician. The technician should also inspect the wiring and connected components to rule out any external cause (such as a short circuit) that may have damaged the board.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Internal control board failure | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The furnace shows a solid red LED and will not operate
- Power cycling does not clear the fault
- The furnace recently experienced a power surge or lightning strike
✓ Verified against manufacturer service manual — March 2026