GSW electric water heater shows E105 and no hot water after a power outage

Safety: Turn off power at the breaker before removing covers.

• Reset ECO: Remove the upper access panel and insulation. Press the red reset button on the upper thermostat until it clicks.
• Check thermostat contact: Ensure the thermostat is firmly against the tank surface. Re-secure if it has pulled away.
• Bleed air: Open a hot water tap to remove trapped air that can cause localized overheating.
• Monitor operation: Restore power and allow the heater to run. If the ECO trips again, a thermostat or element may be faulty and should be tested and replaced.