MEDIUM URGENCY

Goodman 1 Flash — Lockout Due to Excessive Retries

1 flash with extended pause

Locked out after exhausting ignition retry attempts.

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

What This Code Means

A single flash followed by an extended pause means the furnace tried to ignite multiple times and failed, entering safety lockout.

Likely Causes (Ranked)

Most common

Dirty flame sensor

What: Coating prevents flame detection.

How to check: Pull and check for soot.

Fix: Clean with emery cloth.

Shop parts

Common

Failed igniter

What: Igniter not heating up.

How to check: Watch for orange glow.

Fix: Replace.

Shop parts

Common

Gas supply problem

What: Closed valve or low pressure.

How to check: Test valve and other appliances.

Fix: Open valve or call utility.

Diagnostic Steps

Cut power 60s
Watch heat cycle
Clean flame sensor
Replace igniter if no glow
Check gas supply

Frequently Asked Questions

How to clear Goodman 1 flash lockout?

Cut power 60s. Lockout clears but underlying problem must be fixed.

Same on Amana/Daikin?

Yes — sister brands using same controls.

Why does it repeat?

Persistent ignition issue — usually flame sensor or igniter.

Related Goodman Codes

Related Symptoms

Need More Help?

Try our interactive symptom diagnostic tool or browse Goodman parts.

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