Goodman furnace 2 green flashes: Normal operation — high stage or single stage cooling

Two green flashes means the blower is running for high stage cooling, or for a single-stage air conditioner. It is a normal status indication, not a fault.

Applies to: Goodman GMEC96 and Amana AMEC96 two-stage gas furnaces with a three-colour diagnostic LED, running the indoor blower for a cooling call.

What it means

Goodman's own description covers two cases in one code: high stage cooling on a two-stage system, and cooling on a single-stage compressor. Both look the same to the furnace control, because in both the thermostat is calling for full cooling capacity along with the blower. The furnace is running its blower on the cooling speed and burning no gas. As with one green flash, the value in documenting this is separating it from the fault list. Two red flashes on this board is a pressure switch stuck closed and needs attention; two green flashes needs nothing. Anyone counting flashes without registering colour can move from one to the other without noticing.

Most common causes

The thermostat is calling for full cooling on a two-stage system.
A single-stage air conditioner running, which the control reports the same way.
The blower operating on cooling speed, which is normal during any cooling call.

How to diagnose it

Confirm the flashes are green. Colour is what separates status from fault on this board.
Note whether cooling is actually being delivered. If it is, there is nothing here.
If the blower runs and the air is not cool, look at the outdoor unit and the refrigerant circuit rather than at this code.

How to fix it

Nothing. The control is reporting that it is doing its part of a cooling call correctly.

Notes

Goodman groups high stage and single stage cooling under one code because the furnace control cannot distinguish them — it sees the same thermostat inputs either way. That is a limitation of the indication rather than an ambiguity in the equipment.

All codes for this manufacturer

Goodman and Amana furnace fault codes — every code, with what differs between models.

Sources

Goodman Manufacturing — Diagnostic Code Identification System (model-specific fault code lookup)

This site is a reference, not a substitute for a licensed HVAC technician. Gas appliances can leak carbon monoxide and cause fire. Anything involving gas lines, the heat exchanger, or the flame sensing circuit should be handled by a licensed professional. Pages are written with AI assistance from the sources listed on each page and checked against them before publishing.