A.O. Smith Status Light Codes (1

A.O. Smith gas water heaters communicate diagnostic codes through a flashing status light on the gas control valve. We’ve verified the 4-flash code (high-temperature shutdown) in detail; for other flash counts, check the chart printed on your specific unit or A.O. Smith’s own support page, since exact counts can vary slightly by control-valve generation.

Illustration of a lit green status light on the igniter control module of a residential gas water heater.

We’d rather point you to your unit’s own printed chart for a flash count we haven’t verified yet than guess and risk sending you down the wrong repair path.

Codes at a Glance

Code	Meaning
4 flashes	High-temperature shutdown (ECO tripped)	Full guide →
Other counts (1, 2, 3, 5, 6, 7+)	Refer to the chart printed on your unit’s gas control valve or A.O. Smith’s own support page — we’re adding verified guides as we confirm each one against real repair data	Guide coming soon

FAQ

Where is the flash code chart on my unit?

It’s usually printed directly on or near the gas control valve’s status light, and also available through A.O. Smith’s own support pages at aosmithatlowes.com.

Written by HotWater Decoded — water heater repair specialists. Technically reviewed by a licensed technician on our team.

Sources

A.O. Smith’s own support documentation (aosmithatlowes.com) for gas control valve status light codes