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Goodman Error Code E12: Redundant relay open (Furnace)

Updated · by Aurora Star Tech Inc.

Goodman error code E12 on a furnace means: Redundant relay open. It is also called Goodman diagnostic code E12.

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

Homeowner? What Goodman code E12 means for you

Call a technician Your furnace is reporting: Redundant relay open. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

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 E12 mean?

Alarm table lists this as a redundant relay stuck open. The manual gives no causes or fixes for it.

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 E12

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

Other Goodman Furnace codes

CodeMeaning
E6Low flame signal
E7Igniter circuit fault
E8High-stage pressure switch closed at start of heat
E9High-stage pressure switch will not close
E10Grounding fault / poor neutral connection
E11Flame rollout switch open
E13Redundant relay stuck closed
EA115 V polarity reversed
Eb0Blower motor not running
Eb1Lost communication with blower motor
Eb2Blower motor hp does not match model data
Eb3Blower motor running in power, temperature or speed limit

All Goodman Furnace error codes →

Goodman code E12: homeowner questions

What does Goodman code E12 mean?

Redundant relay open. Alarm table lists this as a redundant relay stuck open. The manual gives no causes or fixes for it.

Is it safe to keep using my furnace with code E12?

It depends on the cause. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Goodman code E12 myself?

You can try one reset (power off for 30 seconds, then on). If Goodman code E12 comes back, the cause is still there and a licensed technician should check it.

Who can fix Goodman code E12 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 / Alarm Code Table p.56. 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.

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