Goodman GM9S96 code FAn
Fan command
Quick answer
On Goodman GM9S96 (2020s), FAn is a normal display state, not a fault. The control has been told to run the blower, and the display is confirming that command. It appears on a normal call for heat or cool while the air is being moved. The blower running on its own with no call is worth a look, but the code itself is the board doing what it was asked. A first thing to check: Normal blower operation during a call.
- Applies to
- Goodman GM9S96
- Goodman GM9S96 and GR9S96 alphanumeric codes · Furnace · 2020s
- Type of code
- Status or setup value
- Urgency: nothing to fix
- First safe check
- Check the thermostat fan setting. Continuous or on-high is a common cause of a blower that seems to run constantly.
What FAn means on this model
The control has been told to run the blower, and the display is confirming that command. It appears on a normal call for heat or cool while the air is being moved. The blower running on its own with no call is worth a look, but the code itself is the board doing what it was asked.
Symptoms you will notice
- Display shows the fan command while the system is heating or cooling
- Air is moving from the registers as expected
- Code appears only for the length of a heating or cooling call
Common causes
The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:
- Normal blower operation during a call
- Continuous fan setting, which holds the blower on after the call ends
- Humidifier or dehumidification add-on calling for the fan
What you can safely check
These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.
- Check the thermostat fan setting. Continuous or on-high is a common cause of a blower that seems to run constantly.
- Watch the blower during a call. If it runs when the thermostat asks and stops when the call ends, this is normal.
Do not do these
- ×Do not disconnect the blower to quiet a fan you find annoying. On a furnace that will not light without airflow, that turns a nuisance into a no-heat call.
When to call a technician
Worth scheduling, and worth your own checks first
You can usually keep living with this for a short while, but it will not fix itself. Do the safe checks below first, because a tripped switch or a blocked airflow is a five-minute fix that would otherwise cost you a service call.
- This is a fuel-burning appliance, so treat anything involving a burner, gas valve or flue as technician work. If you smell gas at any point, leave the property and call the gas utility from outside rather than continuing to diagnose.
- If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.
Changing the thermostat fan setting is a settings change, not a repair.
What it costs to fix
Parts
None.
Labor
None unless the blower is running when nothing is calling for it.
DIY or technician
Changing the thermostat fan setting is a settings change, not a repair.
Typical US part and labor ranges, 2026. They vary by region, model and contractor, so treat them as a planning figure, not a quote.
Scope of this code
- Code table
- Goodman GM9S96 and GR9S96 alphanumeric codes
- Models in scope
- Goodman GM9S96, 2020s
- Checked
- Confirm on your own unit
- Find the model number on the data plate, then check this code in the service manual for that model. Manufacturers revise code tables between model years, and a revised board can renumber a fault.