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

Follow Us On:

Logo
Contact US!

Goodman Error Code dF1: Defrost, low-stage gas heat (Furnace)

Updated · by Aurora Star Tech Inc.

Goodman error code dF1 on a furnace means: Defrost, low-stage gas heat. It is also called Goodman diagnostic code dF1.

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

Homeowner? What Goodman code dF1 means for you

Usually minor Your furnace is reporting: Defrost, low-stage gas heat. 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 dF1 mean?

Defrost running with the furnace on low-stage gas heat.

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 dF1

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

Other Goodman Furnace codes

CodeMeaning
C2High-stage cooling
CFM readoutAirflow number (CFM / 100)
CFSComfort setting
CrCode release number
d0No shared data on the control
d4Memory card data rejected
dF2Defrost, high-stage gas heat
dHLDehumidify logic input level
dHUDehumidifier on
E0Lockout - ignition failed 3 times
E1Low-stage pressure switch closed at start of heat
E2Low-stage pressure switch will not close

All Goodman Furnace error codes →

Goodman code dF1: homeowner questions

What does Goodman code dF1 mean?

Defrost, low-stage gas heat. Defrost running with the furnace on low-stage gas heat.

Is it safe to keep using my furnace with code dF1?

Usually yes. Code dF1 is normally minor, but if it keeps coming back have it checked.

Can I reset Goodman code dF1 myself?

You can try one reset (power off for 30 seconds, then on). If Goodman code dF1 comes back, the cause is still there and a licensed technician should check it.

Who can fix Goodman code dF1 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 , Alarm Code Table p.56 / Status Menu table p.57. 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