E9 error and no hot water, control indicates dry‑fire or low water condition

Safety first: Turn off electrical power immediately to prevent element damage. Allow the unit to cool.

• Verify tank is full: Open a hot water faucet fully. It should run with a strong, steady stream of water without sputtering. If air is present, continue running until all air is purged.
• Check cold water supply: Ensure the cold water shutoff valve to the Giant heater is fully open.
• Reset control: After confirming the tank is full, reset the control by cycling power or using the reset button if provided.
• Inspect elements: If the heater was powered dry, the heating elements may be burned out. Test each Giant element for continuity and replace if open.
• Sensor/control replacement: If E9 appears even with a full tank and good elements, the dry‑fire sensor or control board may be faulty and should be replaced by a technician.