How do you fix Goodman F?

Set the thermostat's fan to auto if continuous circulation was not intended. Check any scheduled circulation settings in a smart thermostat. Full steps and safety notes are on this page.

Goodman furnace F: Continuous fan

F means the blower is running continuously without heating or cooling. It is normal, and it is usually because the thermostat's fan setting is on rather than auto.

Applies to: Goodman GMVC96, GMVM97, GCVC96, GCVM97 and Amana AMVC96, AMVM97 series gas furnaces with a two-character alphanumeric display.

What it means

Continuous fan circulates air without heating or cooling it, which some people use deliberately for air filtration or to even out temperatures between rooms. The display shows F while it is happening. It is worth recognising because a blower that runs constantly is one of the more common things people phone about, and on a modern variable-speed furnace continuous fan is quiet and cheap enough that it can run for weeks unnoticed until someone looks at an energy bill or hears it at night.

Most common causes

The thermostat's fan setting is on rather than auto. This is the usual explanation.
A continuous fan schedule configured in a smart thermostat.
A whole-house filtration or ventilation strategy that calls for continuous circulation.
A thermostat wiring fault energising the fan circuit permanently.
A zone control or ventilation system calling for circulation.

How to diagnose it

Check the thermostat's fan setting first — on rather than auto is the answer in most cases.
Check for a scheduled fan setting in a smart thermostat's app, since these are easy to enable and forget.
Note whether the blower stops when the fan setting is changed to auto. If it does, nothing is wrong.
If the blower continues with the thermostat set to auto and no heating or cooling demand, that is a wiring or control issue.

How to fix it

Set the thermostat's fan to auto if continuous circulation was not intended.
Check any scheduled circulation settings in a smart thermostat.
If the blower will not stop with the fan set to auto, that needs a technician — the fan circuit is being energised by something.
Nothing needs fixing if continuous fan is deliberate. It is a legitimate way to run the system.

Notes

Continuous fan on a variable-speed furnace runs at a low speed and uses very little power compared with an older motor, which is exactly why it can run unnoticed for a long time. That is a feature rather than a fault.

All codes for this manufacturer

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

Models this code appears on

From the manufacturer's per-model database. If your model is not listed, this code may not exist on your board, or it may mean something different — check the model page.

What the fix costs

Nearly always nothing: F is the thermostat's fan switch set to ON, and the fix is a button. The cost angle worth knowing is the quiet one — continuous fan runs the blower thousands of extra hours a season, which shows up as electricity and filter wear rather than a repair bill. The paid scenario is F persisting with the fan switch on AUTO and no call present: that is a stuck call or relay question for a technician, starting at a $75–150 diagnostic (repair cost guide) and ending, in the worst case, in control board territory at $400–900 — though the wiring is checked long before the board is blamed.

DIY or call a pro?

Flip the fan setting to AUTO and watch for ten minutes; that resolves the overwhelming majority of these. Replacing thermostat batteries and confirming no schedule is forcing circulation are also yours. The professional line is the persistent case — a blower that runs with no fan call means either a low-voltage wire touching where it should not or a control-side fault, and finding which involves the furnace's terminal strip. One useful fact to hand over: whether F shows on the display during the unwanted running, because that tells the technician the control is commanding the fan rather than the fan running despite it.

What this looks like

From the outside, this usually shows up as the blower runs when it should not — that walkthrough covers what to check in order, and when it stops being a homeowner job.

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.