Goodman Furnace 9 Flashes: Meaning and Fix
Applies to: Goodman GMEC96 two-stage, multi-speed furnaces with a red LED flash code on the control board.
Also shown as: 9 flashes, nine flashes
Reading the furnace display
A furnace reports faults on a small status LED on the control board, seen through the sight glass in the blower door, or on a two-digit display. Watch a full cycle of the pattern and count the flashes, including the pause between groups, before you decide what you saw. The code chart is on the label inside the blower door.
This page lists the fault codes this brand documents, with likely causes and a short repair path. The codes apply to model numbers such as GM9S80 and GC9S80; check the label on your unit to confirm yours.
What causes 9 Flashes
- Hot and neutral reversed at the furnace
- Loose power connection
- Missing or poor ground
How to fix it
If you smell gas, leave the building and call your gas utility from outside; do not touch switches or the furnace. Switch the furnace power off before you open the blower door or touch the igniter or flame sensor, and call a licensed HVAC technician if you are not sure.
The code meaning comes from the manufacturer document listed under Sources. The causes and steps below are general troubleshooting guidance, not the manufacturer's service procedure.
- Switch the furnace power off at the breaker before touching any wiring.
- Do not defeat the ground or the polarity check.
- A licensed electrician or technician should check polarity and the ground connection.
- Check that the wall switch and junction box connections are tight, with power off.
- Restore power and run a heating cycle. If the code returns, call a licensed HVAC technician and give them the code, the board label and the furnace model number.
Questions
What does 9 Flashes mean on a Goodman furnace?
On a Goodman GMEC96 control, 9 red LED flashes indicate a grounding problem or reversed polarity in the 115 volt supply.
Can I reset the furnace myself?
The control can be reset by switching power off at the furnace switch or breaker for about 30 seconds, which clears some lockouts. If the same code returns, the fault is still present and the control will shut the furnace down again. Never bypass a safety switch to keep it running.
When should I call a technician?
Call a licensed HVAC technician for anything involving gas, the pressure switch, the limit or rollout switches, the igniter, the flame sensor or a control board replacement, or if the code keeps coming back after the simple checks.
Other brands with code 9 Flashes
The same code can mean something different on another maker's appliance. Check the brand before you act.
Other Goodman furnace codes
Sources
Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.
Applies to models including GM9S80, GC9S80, GMEC96.