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Goodman gas furnace code Eb9: Low indoor airflow
Gas furnace, Canada and United States
Airflow is lower than the system is asking for. The furnace works at reduced performance or runs on low stage when high stage is expected.
You can often clear this yourself. Work through the causes below in order, most likely first.
What causes it
-
Blocked filters.
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.
- Turn off the electrical power to the furnace before you take the filter out.
-
Restrictive ductwork or registers that are not fully open.
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.
-
Ductwork that is too small for the system.
-
High temperatures around the furnace.
How to read this code on your unit
The code shows on the three-character display on the furnace control board, which you can see through the sight glass on the blower compartment. IdL means the furnace is idle and normal. A blank display means the board has no power or has failed.
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
116 models in 7 ranges
| Range | Models |
|---|---|
| GMVC8 / GCVC8 / AMVC8 / ACVC8 | GMVC80603BN, GMVC80603BX, GMVC80604BN, GMVC80604BX, GMVC80803BN, GMVC80803BX, GMVC80804CN, GMVC80804CX, GMVC80805CN, GMVC80805CX, GMVC80805DN, GMVC80805DX, GMVC81005CN, GMVC81005CX, AMVC80603BN, AMVC80603BX, AMVC80604BN, AMVC80604BX, AMVC80803BN, AMVC80803BX, AMVC80804CN, AMVC80804CX, AMVC80805CN, AMVC80805CX, AMVC80805DN, AMVC80805DX, AMVC81005CN, AMVC81005CX |
| GMVC80 / GCVC80 / AMVC80 / ACVC80 | GMVC800603BN, GMVC800603BX, GMVC800604BN, GMVC800604BX, GMVC800803BN, GMVC800804CN, GMVC800804CX, GMVC800805CN, GMVC800805CX, GMVC800805DN, GMVC800805DX, GMVC801005CN, GMVC801005CX, AMVC800603BN, AMVC800603BX, AMVC800604BN, AMVC800604BX, AMVC800803BN, AMVC800804CN, AMVC800804CX, AMVC800805CN, AMVC800805CX, AMVC800805DN, AMVC801005CN, AMVC801005CX |
| GMVC96 / GCVC96 / AMVC96 / ACVC96 | GMVC960403BN, GMVC960603BN, GMVC960803BN, GMVC960804CN, GMVC961005CN, GMVC961005DN, GMVC961205DN, GCVC960403BN, GCVC960603BN, GCVC960804CN, GCVC961005CN, GCVC961205DN, AMVC960403BN, AMVC960603BN, AMVC960803BN, AMVC960804CN, AMVC961005CN, AMVC961005DN, AMVC961205DN, ACVC960403BN, ACVC960603BN, ACVC960804CN, ACVC961005CN, ACVC961205DN |
| GMVM97 / GCVM97 / AMVM97 / ACVM97 | GMVM970603BN, GMVM970803BN, GMVM970804CN, GMVM971005CN, GMVM971205DN, AMVM970603BN, AMVM970803BN, AMVM970804CN, AMVM971005CN, AMVM971205DN |
| GRVM97 / GDVM97 | GRVM970603BN, GRVM970803BN, GRVM970804CN, GRVM971005CN, GRVM971205DN |
| GRVT80 / GDVT80 | GRVT800603BN, GRVT800603BX, GRVT800604BN, GRVT800604BX, GRVT800803BN, GRVT800804CN, GRVT800804CX, GRVT800805CN, GRVT800805CX, GRVT800805DN, GRVT800805DX, GRVT801005CN, GRVT801005CX, GDVT800603BX, GDVT800803BX, GDVT800805CX, GDVT801005CX |
| GRVT96 / GDVT96 | GRVT960403BN, GRVT960603BN, GRVT960803BN, GRVT960804CN, GRVT961005CN, GRVT961005DN, GRVT961205DN |
Where this comes from
- GMVC96/GCVC96 (revisions BA to BC) gas furnace installation instructions (IOG-2015L) , page 46
- GRVT80/GDVT80 gas furnace installation instructions (IOG-2043B) , page 34
- Gas furnace user's information manual (HIG-2002A) , page 8
- Gas furnace user's information manual (HIG-2001B) , page 8
Checked against the manufacturer's manual on 13 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| b3 | Blower motor limiting its power, temperature or speed | You can often fix it |
| b9 | Low indoor airflow | You can often fix it |
| Eb3 | Blower motor limiting its power, temperature or speed | You can often fix it |
| Eb4 | Blower motor tripped (lost rotor control or high current) | Safe checks first, then a pro |
| Eb5 | Blower motor fails to start (locked rotor) | Call a pro |
| Eb6 | Blower motor shut down for voltage or overheating | Call a pro |
| Eb7 | Blower motor lacks the data it needs to run | Call a pro |
| EbF | Inducer communication error | Call a pro |
| EbL | Blower motor drawing too little current (hard lockout) | Call a pro |
| EbU | Blower motor drawing current during pre-purge (hard lockout) | Call a pro |
| EC | Inducer motor overcurrent | Call a pro |
| ECF | Gas valve stepper motor communication error | Call a pro |