HVACopediaGoodman · Air handler
Eb9 Airflow lower than demanded
What the control is telling you
Delivered airflow is below the requested value; the system may perform poorly or run low stage when high stage is expected.
Applies to: ComfortBridge communicating air handlers AVPTC**14 (B* revision board) and MBVC1201/1601/2001 modular blowers
Likely causes
- Blocked filters or restrictive ductwork
- Undersized ductwork
Test and repair steps
- Clean or replace filters and clear obstructions.
- Check for blocked ducts and closed registers.
- Verify duct sizing; resize or replace ductwork if necessary.
Models that show this code
21 models in Goodman/Amana ComfortBridge AVPTC/MBVC
Other codes on the same units
- Eb4 Blower motor lost rotor control or high current
- Eb5 Blower motor failed to start 10 times
- Eb6 Blower shut down for voltage or power module temperature
- Eb7 Blower motor missing shared data / failed to start 40 times
- EC1 Communication error with the outdoor unit
- Ed0 No shared data on the network
- Ed1 Invalid shared data
- Ed4 Shared data rejected by the control
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Source: Goodman ComfortNet ASXC/GSXC/DSXC, ASZC/GSZC/DSZC, AVPTC/MBVC service manual, Air Handler Troubleshooting Matrix (B*) p.59-60. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.