Water too hot, scalding at taps on Giant water heater without obvious error code

Safety first: Turn off power or gas. Open a hot water tap and verify temperature with a thermometer. Risk of severe scalding above 49°C (120°F).

• Lower setpoint: Reduce the thermostat or digital control setting to a safe level and monitor.
• Check mixing valve: If a thermostatic mixing valve is installed on the outlet, verify it is set correctly and not stuck.
• Inspect thermostat: On electric models, check that the thermostat is firmly against the tank and not damaged. Replace the Giant thermostat if it does not cycle off properly.
• Flush scale: Perform a tank flush to remove scale that can cause delayed temperature sensing.
• Professional service: If overheating continues, have a technician inspect the gas control valve or electronic control for proper operation.