Goodman Furnace 3 (red LED) error code
The inducer (draft) fan could not build enough pressure to close the pressure switch, so the control will not start the ignition sequence.
Also shown as: 3 red flashes, three red flashes, fault code 3 red, inducer pressure fault
Last updated: September 30, 2026
What causes the 3 (red LED) error?
- Blocked or pinched pressure-switch hoses
- Blocked combustion-air intake or exhaust flue
- Weak or failing inducer motor
How to fix Goodman 3 (red LED) — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Clear the intake and exhaust terminations
Go outside and check the furnace's intake and exhaust pipes for leaves, snow, ice, nests, or debris, and clear anything blocking them. - Inspect the pressure-switch hoses
With the power off, check the small rubber hoses for kinks, cracks, or water trapped inside. - Have the inducer and switch tested
A technician can measure draft pressure and test the inducer motor and pressure switch.
When to call a technician
- Vents are clear but the code persists
- The inducer fan sounds weak, loud, or does not start at all
Frequently asked questions
Can a blocked vent really stop the furnace?
Yes. The furnace refuses to fire unless it can prove exhaust gases are venting outside — a blocked flue is a carbon monoxide hazard, so the lockout is intentional.
Will this fix itself when snow melts?
Sometimes, if ice or snow was the blockage. But if the code stays after the pipes are clear, the switch or inducer needs testing.
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.