Thermostat shows E11 and the app reports ‘Valve actuator error’ on one or more Ngenic smart radiator valves.

Safety: Radiator valves may be hot. Use gloves. No mains voltage is present at battery-powered actuators.

• Replace batteries: Open the Ngenic smart radiator valve and install fresh batteries of the specified type.
• Check mounting: Ensure the actuator is firmly screwed onto the valve body and correctly adapted (use the proper adapter ring if required).
• Free the valve pin: Remove the actuator and gently press the radiator valve pin in and out with a blunt tool until it moves freely.
• Re-calibrate: Use the app to run a calibration or ‘valve test’ so the actuator can learn the open/close positions.

If E11 remains on a specific valve after these steps, the Ngenic smart radiator valve actuator is likely defective and should be replaced.