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 indicates the furnace is actively heating in first-stage (low) mode. The control board is receiving a W1 (first-stage heat) signal from the thermostat and has successfully completed the ignition sequence. The burners are firing at the lower heat output level.
The GMEC960803BN is a two-stage gas furnace, meaning it can fire at approximately 60-65% capacity (first stage) or full capacity (second stage). First-stage operation is the primary mode the furnace uses under normal conditions. It provides quieter, more efficient heating with longer run times, which results in more even temperatures throughout the home and less temperature swing between cycles.
The amber LED color distinguishes heating operations from cooling and fan operations, which use the green LED. Seeing amber 1 flash during cold weather is completely expected. The furnace will automatically step up to second-stage heating if the first stage cannot meet the heating demand within the thermostat's configured time limit.
- If the furnace runs in first stage for extended periods without warming the home — the gas pressure, heat exchanger, or ductwork may need professional evaluation
✓ Verified against manufacturer service manual — March 2026