Icon
Reliable Heating and Cooling Solutions – Quality Service, Fair Prices, Guaranteed Satisfaction!

Follow Us On:

Logo
Contact US!

Goodman Error Code FSd: Constant fan speed (Furnace)

Updated · by Aurora Star Tech Inc.

Goodman error code FSd on a furnace means: Constant fan speed. It is also called Goodman diagnostic code FSd.

Low severityFurnaceGoodman/Amana *MVC96 (34.5 in. chassis)

Homeowner? What Goodman code FSd means for you

Usually minor Your furnace is reporting: Constant fan speed. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

  • Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
  • Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
  • Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
  • Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
  • Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
  • Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
  • Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Goodman error code FSd mean?

Sets constant-fan airflow as a percent of the furnace maximum CFM, in 10% steps. Default is 25%. Maximum CFM is 1400 on 3 ton, 1760 on 4 ton and 2200 on 5 ton models.

Applies to: GMVC96, GCVC96, AMVC96, ACVC96 (*BA, ComfortBridge)

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Goodman models that use code FSd

*CVC960403BNB**CVC960603BNB**CVC960804CNB**CVC961005CNB**CVC961205DNB**MVC960403BNB**MVC960603BNB**MVC960803BNB**MVC960804CNB**MVC961005CNB**MVC961005DNB**MVC961205DNB*ACVC96AMVC96GCVC96GMVC96

Other Goodman Furnace codes

CodeMeaning
EELIgniter relay / igniter circuit fault
EEnIgniter open
EOLOEM test mode
ErrActive alarm menu
FContinuous fan
FAnContinuous fan
gAFGas heat airflow
gbPBackup heat balance points
gFdGas heat fan off delay
gHGas heat, single stage
gH1Gas heat, low stage
gH2Gas heat, high stage

All Goodman Furnace error codes →

Goodman code FSd: homeowner questions

What does Goodman code FSd mean?

Constant fan speed. Sets constant-fan airflow as a percent of the furnace maximum CFM, in 10% steps. Default is 25%. Maximum CFM is 1400 on 3 ton, 1760 on 4 ton and 2200 on 5 ton models.

Is it safe to keep using my furnace with code FSd?

Usually yes. Code FSd is normally minor, but if it keeps coming back have it checked.

Can I reset Goodman code FSd myself?

You can try one reset (power off for 30 seconds, then on). If Goodman code FSd comes back, the cause is still there and a licensed technician should check it.

Who can fix Goodman code FSd near me?

Aurora Star Tech Inc. repairs Goodman furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

Troubleshooting guides

Source: Goodman Service and Troubleshooting ACVC96*BA/AMVC96*BA/GCVC96*BA/GMVC96*BA , Furnace menu table p.58 and Menus p.34-35. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

© 2026 Aurora Star Tech Inc. All rights reserved. This page may not be copied, republished or used to train other systems without written permission.

Emergency Furnace Repair

647-657-2977