Goodman GMEC960803BN Error Code Amber 4 Flashes: Y Present With No G Call, Y1 Present With No G Call
What Does Code Amber 4 Flashes Mean?
Four amber flashes on the Goodman GMEC960803BN control board indicate that the control module is detecting a Y (cooling) signal without a G (fan) signal from the thermostat. Under normal operation, a cooling call always includes a fan call — the blower must run to distribute conditioned air. Receiving Y without G is an invalid thermostat signal combination.
This code is typically caused by incorrect thermostat wiring. If a thermostat was recently installed or replaced, the wires may be connected to the wrong terminals. A malfunctioning thermostat relay board can also send a cooling signal without activating the fan relay.
The furnace will not operate in this mode to prevent the air conditioning system from running without airflow, which could cause the evaporator coil to freeze. Once the wiring is corrected so that G is present whenever Y is called, the system will function normally.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Improperly connected thermostat wires | Most common | ✗ Call a pro → |
| Faulty thermostat | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The furnace shows 4 amber flashes and will not operate
- You recently installed or replaced the thermostat
- The thermostat wiring appears correct but the error persists
✓ Verified against manufacturer service manual — March 2026