A.O. Smith Water Heater Error Code 5 Flash: How to Fix It

Q: What does 5 flashes mean on an A.O. Smith water heater?

5 flashes on an A.O. Smith water heater indicates a sensor failure on the gas control valve. This means the valve cannot properly detect temperature or flame conditions, preventing normal heating operation.

Q: Can I reset A.O. Smith error code 5 flash?

You can attempt to reset the system by turning the gas control to OFF for 10 minutes, then relighting the pilot. However, if the underlying sensor failure isn't resolved, the error will return.

Q: How much does it cost to fix A.O. Smith 5 flash error?

Repair costs range from $50-150 if only sensors need replacement, to $300-500 for complete gas valve replacement including professional installation. The gas control valve itself typically costs $150-300.

Q: Is A.O. Smith 5 flash error dangerous?

While not immediately dangerous, this error prevents proper water heating and can indicate gas control problems. The water heater should not be operated until the sensor failure is resolved to ensure safe gas valve operation.

Q: How long do A.O. Smith gas control valves last?

A.O. Smith gas control valves typically last 8-12 years under normal conditions. Sensor failures can occur earlier due to corrosion, electrical issues, or manufacturing defects.

Abstract

The A.O. Smith water heater 5 flash error code indicates a sensor failure on the gas control valve, which prevents your unit from heating water properly. This is a serious issue that requires immediate attention to restore hot water and ensure safe operation. While some diagnostic steps can be performed by homeowners, this error often requires professional repair or gas valve replacement.