A.O. Smith Water Heater Error Code 10: How to Fix It

Q: Why does my A.O. Smith water heater keep showing error code 10?

Repeated error code 10 indicates an underlying issue causing overheating, such as a faulty thermostat, failing heating element, sediment buildup, or incorrect temperature settings. Professional diagnosis is recommended for recurring trips.

Q: Is it safe to reset the ECO on my A.O. Smith water heater?

Yes, resetting the ECO is safe and designed for homeowner use. However, investigate why it tripped in the first place. If it trips repeatedly, stop using the water heater and call a professional as this indicates a serious problem.

Q: What causes the ECO to trip on A.O. Smith water heaters?

Common causes include thermostat failure, faulty heating elements, sediment buildup reducing efficiency, incorrect temperature settings above 120°F, poor electrical connections, or inadequate ventilation around the unit.

Q: How long should I wait before resetting error code 10?

Wait at least 10 minutes after turning off power to allow the water heater components to cool down. This ensures safe handling and may help the reset process work more effectively.

Q: Can I prevent A.O. Smith error code 10 from happening again?

Yes, maintain proper temperature settings (120°F or lower), flush the tank annually to remove sediment, ensure adequate ventilation around the unit, and have regular professional maintenance to check thermostats and heating elements.

Abstract

A.O. Smith water heater error code 10 indicates the ECO (Energy Cut Off) has tripped, meaning the thermostat detected dangerously high temperatures and shut down the unit for safety. This critical safety feature prevents overheating and potential damage to your water heater.