Verified manufacturer-source collection
A.O. Smith Water Heater Error Codes
Choose the code exactly as shown. Meanings and reset procedures can change across model families, display formats and markets.
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1 flash Official A.O. Smith material describes 1 flash as Low flame signal; the control continues to operate. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 1 flash, 1flash caution 2 flash Official A.O. Smith material describes 2 flash as Pressure switch failed closed. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 2 flash, 2flash caution 3 flash Official A.O. Smith material describes 3 flash as Pressure switch failed open. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 3 flash, 3flash caution 4 flash Official A.O. Smith material describes 4 flash as ECO (Energy Cut Off) limit thermostat temperature limit was exceeded; the main burner is shut off. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 4 flash, 4flash stop-use 5 flash Official A.O. Smith material describes 5 flash as Flame out of sequence sensed. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 5 flash, 5flash caution 6-1 flash Official A.O. Smith material describes 6-1 flash as Retry limit exceeded (failed trial for ignition). This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 6-1 flash, 61flash caution 6-2 flash Official A.O. Smith material describes 6-2 flash as Recycle limit exceeded: pressure switch/high limit opened. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 6-2 flash, 62flash caution 6-3 flash Official A.O. Smith material describes 6-3 flash as Recycle limit exceeded: flame lost. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 6-3 flash, 63flash caution 6-4 flash Official A.O. Smith material describes 6-4 flash as Recycle limit exceeded: flame out of sequence. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 6-4 flash, 64flash caution 7 flash Official A.O. Smith material describes 7 flash as Flammable Vapor Sensor (FVS) lockout. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 7 flash, 7flash stop-use 8-1 flash Official A.O. Smith material describes 8-1 flash as Flammable Vapor Sensor fault detected. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 8-1 flash, 81flash stop-use 8-2 flash Official A.O. Smith material describes 8-2 flash as Temperature sensor fault detected. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 8-2 flash, 82flash caution 8-3 flash Official A.O. Smith material describes 8-3 flash as Electronics fault detected. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 8-3 flash, 83flash caution 8-4 flash Official A.O. Smith material describes 8-4 flash as Valve fault detected. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: 8-4 flash, 84flash caution