Goodman · Furnace / HVAC
3 flashes Pressure switch fault
What this code means
Goodman/Amana boards typically communicate through an LED blink count rather than a number — three flashes is commonly a pressure switch circuit that isn't closing.
Most likely causes
- Vent pipe blocked or disconnected
- Inducer motor weak or failing
- Condensate drain clogged, tripping a float switch
What to try first
Inspect the intake and exhaust PVC pipes outside for blockage, and check the condensate drain line for a clog.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
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What does Goodman error code 3 flashes mean?
Pressure switch fault. Goodman/Amana boards typically communicate through an LED blink count rather than a number — three flashes is commonly a pressure switch circuit that isn't closing.
Can I fix Goodman code 3 flashes myself?
Usually not. Inspect the intake and exhaust PVC pipes outside for blockage, and check the condensate drain line for a clog. If the code returns after one reset, it needs a licensed technician.
What causes Goodman code 3 flashes?
The most common causes are: vent pipe blocked or disconnected; inducer motor weak or failing; condensate drain clogged, tripping a float switch.
Other furnace brands: Trane · Carrier · Lennox · Amana · American Standard · Rheem · Bryant · Generic · Nest
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.