Vaillant smart thermostat buttons or touchscreen are unresponsive or register incorrect presses.

Safety: Low‑voltage only; avoid opening sealed units beyond user access.

• 1. Reboot device: Power cycle the thermostat or remove and reinsert batteries to clear temporary software issues.
• 2. Clean surface: Gently clean the screen or buttons with a soft, slightly damp cloth. Do not use solvents or excessive moisture.
• 3. Check for physical damage: Inspect for cracks, dents, or signs of impact. Physical damage usually requires replacement.
• 4. Use app as workaround: If the app can still control the system, use it temporarily while arranging thermostat replacement.
• 5. Replace thermostat: If buttons/touch remain unreliable, replace the thermostat unit.