Error Code Green LED Rapid Flash
Info

Goodman GMEC960803BN Error Code Green LED Rapid Flash: Normal Operation - Fan Call (G)

TL;DR
Your furnace fan is running in fan-only mode in response to a thermostat fan call. This is normal operation.
Disclaimer
This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code Green LED Rapid Flash Mean?

A rapidly flashing green LED on the Goodman GMEC960803BN indicates the blower is running in fan-only mode. The control board is receiving 24 volts on the G (fan) terminal from the thermostat, which commands the blower to run without activating the heating or cooling system.

This is a normal operating mode that occurs when your thermostat's fan switch is set to ON rather than AUTO, or when a fan-only cycle is programmed. In fan-only mode, the blower circulates air through the ductwork without heating or cooling it, which can help even out temperatures between rooms and improve air filtration.

Some thermostats also activate fan-only mode during a circulation cycle to periodically move air even when no heating or cooling call is active. If you are seeing this status and did not expect the fan to be running, check your thermostat's fan setting — switching it from ON to AUTO will stop the fan-only operation and let the furnace control the fan automatically during heating and cooling cycles.

Contact a licensed HVAC technician if any of these apply:

Sources

  1. *MEC96 & *CEC96 Two-Stage Gas Furnaces

✓ Verified against manufacturer service manual — March 2026