Amana AMSS960803BN Error Code 1 Flash: System Lockout

What Does Code 1 Flash Mean?

A single flash on the Amana AMSS960803BN Integrated Control Module means the furnace has entered ignition lockout after three failed attempts to establish flame. The board counts the retries and, once it reaches three, stops trying so it will not keep cycling gas without a proven flame. This module then locks out and automatically attempts to restart about one hour later.

An ignition lockout happens two ways: the burners never lit, or a flame was established and then lost. Failure to establish flame points to no gas at the burners, a stuck-open front cover pressure switch, a bad or misaligned hot surface igniter, improper orifices, or a coated, oxidized, or poorly connected flame sensor. Loss of flame after it lights points to an interrupted gas supply, lazy burner flames from improper gas pressure or a restricted flue/combustion-air path, the front cover pressure switch opening, or a weak induced draft blower.

This lockout sits at the end of a chain of related codes on the same board. The seven-flash low-flame-signal warning often appears first, as a fouled flame sensor reads progressively weaker until it can no longer prove flame and the furnace drops to a one-flash lockout. An eight-flash igniter-circuit fault can also lead here if the igniter cannot heat the burners. Because the likely causes involve the gas train and ignition system, Amana lists this as professional service on this model rather than a homeowner repair.

What You'll Notice

• The furnace tries to light — you hear the inducer run and the igniter cycle — then goes silent and stops
• The diagnostic LED flashes once, pauses, and repeats
• No heat, and the furnace stays locked out until it automatically retries roughly an hour later
• On repeated lockouts the house cools noticeably during the hour-long gaps between attempts

Common Causes

How This Is Diagnosed

Because several systems can prevent a proven flame, a technician isolates the cause in order of likelihood. They first confirm the gas supply is on and both the manual and automatic gas valves are open, then inspect the flame sensor — the most common culprit — cleaning the rod with a Scotch-Brite pad if it is coated or oxidized and confirming it sits correctly in the burner flame. Next they check the hot surface igniter for a proper glow and alignment and verify the front cover pressure switch and induced draft blower are moving enough combustion air. Because this work reaches into the gas train and ignition circuit, it is not a homeowner repair on this furnace.

When to Call a Professional

This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:

• The furnace locks out on one flash again after the automatic one-hour retry
• You hear the igniter and inducer run but the burners never stay lit
• The lockout returns shortly after a service visit or filter change
• The furnace lights briefly and then drops out, pointing to a lost flame rather than a failed light

✓ Verified against manufacturer service manual — March 2026