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MEDIUM URGENCY

Goodman 3 Flashes — Open Pressure Switch With Inducer On

3 flashes

Pressure switch open during inducer operation — vent or inducer issue.

Brand: Goodman (Also covers Amana, Daikin)  |  Equipment: Gas Furnace

What This Code Means

3 flashes means the pressure switch did not close after the inducer started. Usually means insufficient draft.

Likely Causes (Ranked)

Most common

Blocked exhaust vent

What: Snow, ice, or debris blocking exhaust.

How to check: Inspect outdoor exhaust.

Fix: Clear blockage.

Shop parts
Common

Failed inducer motor

What: Inducer can't create enough draft.

How to check: Listen at startup.

Fix: Replace inducer.

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Common

Bad pressure switch

What: Switch won't close on proper pressure.

How to check: Tech test with manometer.

Fix: Replace switch.

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Diagnostic Steps

  1. Inspect outdoor exhaust
  2. Listen for inducer
  3. Check tubing
  4. Replace switch if needed

Frequently Asked Questions

Most common Goodman 3 flashes cause?
Blocked exhaust vent.
DIY?
Vent clearing yes. Inducer more advanced.
Same on Amana?
Yes.

Related Goodman Codes

Goodman Error Code 2 Flashes

Related Symptoms

Furnace Not IgnitingFurnace Blowing Cold Air

Need More Help?

Try our interactive symptom diagnostic tool or browse Goodman parts.

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