HIGH URGENCY

Goodman 9 Flashes — Grounding or Polarity Reversed

9 flashes

Grounding or polarity reversed — wiring issue.

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

What This Code Means

9 flashes means the line voltage polarity is reversed or there's a grounding fault. Electrical wiring needs attention.

Most common

What: Wires swapped at the disconnect or in home wiring.

How to check: Electrician test.

Fix: Correct wiring.

Common

What: Improper or missing ground.

How to check: Electrician verify.

Fix: Restore ground.

Can I fix Goodman 9 flashes myself?

Only if qualified for line voltage work.

Will it damage the furnace?

Can damage control board over time.

Same on Amana?

Yes.