Smart Radiator Thermostat makes loud clicking or grinding noises during operation.

Safety first: Let the radiator cool before handling the valve.

• Observe calibration: Trigger a calibration from the app and listen to the noise. Short, soft clicks are normal; loud grinding suggests mechanical stress.
• Check adapter fit: Remove the Tado head and verify the adapter is the correct type and firmly attached. Replace with the correct adapter if necessary.
• Check valve pin travel: Gently press the valve pin to feel its travel. Extremely long or stiff travel can overload the motor; a plumber may need to replace the valve body.
• Replace noisy head: If the noise persists on a correctly fitted valve, the internal gears are likely worn and the Smart Radiator Thermostat should be replaced.