Goodman GMEC960803BN Error Code Amber 1 Flash: Normal Operation - First Stage Heat (W1)
What Does Code Amber 1 Flash Mean?
A single amber flash on the Goodman GMEC960803BN's Integrated Control Module indicates normal operation with a first-stage (W1) heat call. As a two-stage furnace, this model normally starts and runs on low fire, which is quieter, gentler on the heat exchanger, and more efficient than full output.
On this board, amber is reserved for normal heating calls: amber 1 flash is first-stage (low) heat and amber 2 flashes is second-stage (high) heat. Seeing amber 1 flash during a heating cycle means the burners are lit on low fire and the furnace is satisfying the thermostat at its lower capacity.
Most of a typical heating cycle on the GMEC960803BN happens in first stage. The furnace only steps up to second stage (amber 2 flashes) when low fire cannot keep up with demand, such as during very cold weather or after a large setback recovery.
What You'll Notice
- Steady, comfortable warm airflow from the registers during a heating cycle
- A single amber flash on the control board while the burners run on low fire
How This Is Diagnosed
No diagnosis is needed — this is a normal low-stage heat indication. If the home is not keeping up and the furnace never steps up to second stage, the thermostat staging configuration and the W1/W2 wiring can be reviewed, but amber 1 flash by itself confirms the furnace is correctly heating on first stage.
- The furnace stays on first stage and cannot maintain temperature in very cold weather even though it should be stepping up to second stage
Frequently Asked Questions
What does one amber flash mean on my Goodman furnace?
It means the furnace is running normally in first-stage (low) heat. This is the efficient, quieter setting the GMEC960803BN uses for most of a heating cycle.
Why does my two-stage furnace run on low heat most of the time?
Two-stage furnaces are designed to run on low fire whenever it can meet demand because it is quieter and more efficient. It steps up to second stage (amber 2 flashes) only when more heat is needed.
✓ Verified against manufacturer service manual — March 2026