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Goodman gas furnace steady red light: Normal operation or control board internal fault
Gas furnace, Canada and United States
This code means one of two things, depending on your model. Find your model family below, then read the section for it. The model number is on the rating label on the side of the unit.
Find your model family
| If you have | It means |
|---|---|
| GDH8, GDS8, GKS9, GMH8 / AMH8, GMH95 / GCH95 / AMH95, GMS8 / AMS8, GMSS92 / GCSS92 / AMSS92, GMSS96 / GCSS96 / AMSS96 / ACSS96, GMES80 / GCES80 / AMES80 / ACES80, GMES92, GMES96 / GCES96 / AMES96 / ACES96 | Normal operation |
| GMEC96 / GCEC96 / AMEC96 / ACEC96 | Control board internal fault |
Normal operation
On GDH8, GDS8, GKS9, GMH8 / AMH8, GMH95 / GCH95 / AMH95, GMS8 / AMS8, GMSS92 / GCSS92 / AMSS92, GMSS96 / GCSS96 / AMSS96 / ACSS96, GMES80 / GCES80 / AMES80 / ACES80, GMES92, GMES96 / GCES96 / AMES96 / ACES96.
A steady red light means the control board has power and is not reporting a fault.
You can often clear this yourself. Work through the causes below in order, most likely first.
What causes it
-
This is normal. If the house is still not heating properly, work through the owner checks for the thermostat, power, filter and grilles before calling for service.
Check the thermostat and the power to the furnaceYou can do this
- Check the thermostat is working and set to HEAT above the room temperature, or to COOL below it if the problem is with cooling.
- If the blower runs all the time, look at the thermostat's fan switch. ON runs the blower constantly; AUTO runs it only while heating or cooling.
- Check that the power switch for the furnace, often a switch on or near it, is turned on.
- Check the electrical panel for a tripped circuit breaker or a failed fuse for the furnace. Reset the breaker or replace the fuse. If the breaker trips again, leave it off and call a qualified servicer.
- Make sure both furnace doors are in place. A switch stops the furnace from running while the blower door is off.
Check and replace the furnace air filterYou can do this
- Turn off the electrical power to the furnace before you take the filter out. Never run the furnace without a filter in place.
- Find the filter. It sits outside the furnace cabinet, in a return air grille, a filter rack on the side of the furnace, or the duct next to it. If you cannot find or reach it, ask your installer.
- Replace a dirty disposable filter with one of the same size that meets UL900 or CAN/ULC-S111. Wash and dry a permanent filter the way its maker describes.
- Fit the filter so the air flows through it in the same direction as before, then turn the power back on.
- Check the filter at least once a month and clean or replace it when it is dirty. A dirty filter is the most common cause of a furnace not working properly.
Clear blocked supply and return grillesYou can do this
- Go round the house and look at every supply register and return air grille.
- Move furniture, curtains, clothes, rugs or anything else that covers or blocks them.
How to read this code on your unit
Models that show this code
220 models in 11 ranges
| Range | Models |
|---|---|
| GDH8 | GDH80403AN, GDH80403AX, GDH80603AN, GDH80603AX, GDH80804BN, GDH80804BX, GDH81005CN, GDH81005CX |
| GDS8 | GDS80403AN, GDS80403AX, GDS80603AN, GDS80603AX, GDS80804BN, GDS80804BX, GDS81005CN, GDS81005CX |
| GKS9 | GKS90453BX, GKS90703BX, GKS90704CX, GKS90904CX, GKS90905DX, GKS91155DX |
| GMH8 / AMH8 | GMH80403AN, GMH80403AX, GMH80603AN, GMH80603AX, GMH80604BN, GMH80604BX, GMH80803BN, GMH80803BX, GMH80804BN, GMH80804BX, GMH80805CN, GMH80805CX, GMH81005CN, GMH81005CX, GMH81205DN, GMH81205DX, GMH81405DN, AMH80403AN, AMH80403AX, AMH80603AN, AMH80603AX, AMH80604BN, AMH80604BX, AMH80803BN, AMH80803BX, AMH80804BN, AMH80804BX, AMH80805CN, AMH80805CX, AMH81005CN, AMH81005CX, AMH81205DN, AMH81205DX, AMH81405DX |
| GMH95 / GCH95 / AMH95 | GMH950453BX, GMH950703BX, GMH950704CX, GMH950904CX, GMH950905CX, GMH950905DX, GMH951155DX, AMH950453BX, AMH950703BX, AMH950704CX, AMH950904CX, AMH950905CX, AMH950905DX, AMH951155DX, GCH950453BX, GCH950703BX, GCH950704CX, GCH950905DX |
| GMS8 / AMS8 | GMS80403AN, GMS80403AX, GMS80603AN, GMS80603AX, GMS80604BN, GMS80604BX, GMS80804BN, GMS80804BX, GMS80805CN, GMS80805CX, GMS81005CN, GMS81005CX, GMS81205DN, GMS81205DX, GMS81405DN, AMS80403AX, AMS80603AX, AMS80604BX, AMS80804BX, AMS80805CX, AMS81005CX, AMS81205DX, AMS81405DN |
| GMSS92 / GCSS92 / AMSS92 | GMSS920402BN, GMSS920403AN, GMSS920603BN, GMSS920803BN, GMSS920804CN, GMSS920805CN, GMSS921004CN, GMSS921005CN, GMSS921205DN, AMSS920402BN, AMSS920403AN, AMSS920603BN, AMSS920803BN, AMSS920804CN, AMSS920805CN, AMSS921004CN, AMSS921005CN, AMSS921205DN, GCSS920402BN, GCSS920603BN, GCSS920804CN, GCSS921005CN |
| GMSS96 / GCSS96 / AMSS96 / ACSS96 | GMSS960402BN, GMSS960403AN, GMSS960603BN, GMSS960803BN, GMSS960804CN, GMSS960805CN, GMSS961005CN, GMSS961205DN, AMSS960402BN, AMSS960403AN, AMSS960603BN, AMSS960803BN, AMSS960804CN, AMSS960805CN, AMSS961005CN, AMSS961205DN, GCSS960402BN, GCSS960603BN, GCSS960804CN, GCSS961005CN, GCSS961205DN, ACSS960402BN, ACSS960603BN, ACSS960804CN, ACSS961005CN, ACSS961205DN |
| GMES80 / GCES80 / AMES80 / ACES80 | GMES800403AN, GMES800403AX, GMES800603AN, GMES800603AX, GMES800603BN, GMES800603BX, GMES800604BN, GMES800604BX, GMES800803BN, GMES800803BX, GMES800804BN, GMES800804BX, GMES800804CN, GMES800804CX, GMES800805CN, GMES800805CX, GMES801005CN, GMES801005CX, GMES801205DN, AMES800403AX, AMES800603AX, AMES800603BN, AMES800604BX, AMES800803BX, AMES800804BX, AMES800804CX, AMES800805CX, AMES801005CX, AMES801205DX, GCES800403AN, GCES800403AX, GCES800603AN, GCES800603AX, GCES800804BN, GCES800804BX, GCES801005CN, GCES801005CX, ACES800403AN, ACES800403AX, ACES800603AN, ACES800603AX, ACES800804BX, ACES801005CX |
| GMES92 | GMES920403AN, GMES920603BN, GMES920803BN, GMES920804CN, GMES920805CN, GMES921004CN, GMES921005CN, GMES921205DN |
| GMES96 / GCES96 / AMES96 / ACES96 | GMES960403AN, GMES960603BN, GMES960803BN, GMES960804CN, GMES960805CN, GMES961005CN, GMES961205DN, AMES960403AN, AMES960603BN, AMES960803BN, AMES960804CN, AMES960805CN, AMES961005CN, AMES961205DN, GCES960403BN, GCES960603BN, GCES960804CN, GCES961005CN, GCES961205DN, ACES960403BN, ACES960603BN, ACES960804CN, ACES961005CN, ACES961205DN |
Where this comes from
- GMS8/GMH8 gas furnace installation instructions (IO-446F) , page 38
- GMSS92/GMSS96 gas furnace installation instructions (IOG-2009Q) , page 42
- GMH95 gas furnace installation instructions (IO-299R) , page 42
- GKS9 gas furnace installation instructions (IO-300O) , page 35
- Gas furnace user's information manual (HI-130) , page 8
- GMES80 gas furnace installation instructions (IOG-2021H) , page 29
- GMES92/GMES96 gas furnace installation instructions (IOG-2020J) , page 40
Checked against the manufacturer's manual on 9 October 2026.
Control board internal fault
On GMEC96 / GCEC96 / AMEC96 / ACEC96.
A steady red light means the control board has found an internal fault in its gas valve, microprocessor or frequency checks. The furnace does not run.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
This involves the gas supply or burner. Only a licensed technician should open the unit or work on gas parts.
What causes it
-
The control board has an internal fault and needs replacing.
How to read this code on your unit
Booking a licensed gas technician
Book a licensed gas technicianlicensed gas technician
- Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
- Note the code, how often it appears, and the model and serial numbers from the rating label.
- Book a licensed gas technician and give them those details.
Models that show this code
30 models in 1 range
| Range | Models |
|---|---|
| GMEC96 / GCEC96 / AMEC96 / ACEC96 | GMEC960302BN, GMEC960303AN, GMEC960402BN, GMEC960403AN, GMEC960603AN, GMEC960603BN, GMEC960803BN, GMEC960804CN, GMEC961004CN, GMEC961005CN, GMEC961205DN, AMEC960302BN, AMEC960303AN, AMEC960402BN, AMEC960403AN, AMEC960603AN, AMEC960603BN, AMEC960803BN, AMEC960804CN, AMEC961004CN, AMEC961005CN, AMEC961205DN, GCEC960403BN, GCEC960603BN, GCEC960803BN, GCEC961005CN, ACEC960403BN, ACEC960603BN, ACEC960803BN, ACEC961005CN |
Where this comes from
Checked against the manufacturer's manual on 9 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| EEE | Internal control board fault | Call a pro |
| EEJ | Inducer relay error | Call a pro |
| IdL | Idle, normal operation | You can often fix it |
| IF | Internal control board fault | Call a pro |
| 1 amber flash | Low-stage heat call | You can often fix it |
| 2 amber flashes | High-stage or single-stage heat call | You can often fix it |
| 1 green flash | Low-stage cooling call | You can often fix it |
| 2 green flashes | High-stage or single-stage cooling call | You can often fix it |
| green light flashing rapidly | Fan-only call | You can often fix it |
| steady green light | Standby, waiting for a call | You can often fix it |
| red light flashing rapidly | Electrical fault or configuration error (depends on model) | Call a pro |
| On | Normal operation | You can often fix it |
See all normal operation codes on gas furnaces across brands.
See all control board fault codes on gas furnaces across brands.