Goodman Furnace 8 (red LED) error code
The control board sees the inducer motor running faster than expected, or its drive signal is out of range — usually because a vent blockage is changing the draft the motor has to push against.
Also shown as: 8 red flashes, eight red flashes, fault code 8 red, inducer over-speed, inducer drive signal fault
Last updated: September 30, 2026
What causes the 8 (red LED) error?
- Blocked or restricted vent/flue
- Failing inducer motor
- Control board drive fault
How to fix Goodman 8 (red LED) — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Clear vent terminations
Check the intake and exhaust pipes outside for obstructions such as nests, leaves, ice, or debris. - Power-cycle once
Turn the furnace off for 30 seconds and back on. If the code returns, the motor or board needs testing. - Call a technician
Inducer speed and drive-signal faults are diagnosed with a meter and manometer by a professional.
When to call a technician
- The code persists with clear vents
- The inducer sounds unusually loud or changes pitch constantly
Frequently asked questions
Why would a blocked vent make the motor run faster?
The motor's electronics compensate for the changed airflow resistance; the control flags the out-of-range signal as a fault.
Is this related to the 3-flash code?
Both involve the inducer and venting. Three flashes means the inducer could not build pressure; eight flashes means it is running out of its expected range — a technician checks the same vent system for both.
Sources
Every meaning and fix above was checked against official manufacturer documentation:
FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.