A.O. Smith Water Heater Error Code 8 Flash: How to Fix It

Q: What causes A.O. Smith error code 8 flash?

Error code 8 flash is caused by a clogged flame arrestor screen that blocks proper airflow to the gas burner. This typically happens due to lint, dust, pet hair, or other debris accumulating on the screen over time.

Q: How often should I clean the flame arrestor on my A.O. Smith water heater?

Clean the flame arrestor every 6-12 months, or more frequently if your home has pets, high dust levels, or the water heater is located in a laundry area where lint is common.

Q: Can I run my water heater with a damaged flame arrestor?

No, never operate your water heater with a damaged or missing flame arrestor. This safety device prevents flashback and ensures proper combustion. A damaged screen must be replaced immediately.

Q: Why does my A.O. Smith water heater keep showing 8 flash after cleaning?

If the error persists after thorough cleaning, the flame arrestor may be damaged and need replacement, there could be a ventilation problem, or another component like the gas valve or control board may have failed.

Q: Is it safe to reset my water heater after getting error code 8 flash?

Only reset your water heater after properly cleaning or replacing the flame arrestor. Resetting without fixing the underlying airflow problem can lead to unsafe combustion conditions.

Abstract

The A.O. Smith water heater error code 8 flash indicates a combustion shutdown due to a clogged flame arrestor air filter. This safety feature prevents dangerous operation when proper airflow is blocked, and the issue must be resolved immediately to restore hot water and ensure safe operation.