Bosch EasyControl emits unusual buzzing or high-pitched noise during operation.

Safety first: Switch off power before touching or removing the unit.

• 1. Confirm source: Place your ear close to the EasyControl to ensure the noise is from the thermostat, not the boiler or another device.
• 2. Check mounting: Ensure the wall plate is firmly fixed and the unit is securely clipped, reducing vibration.
• 3. Monitor behavior: Note whether the noise occurs only during certain operations (e.g., Wi‑Fi activity, backlight on).

Professional help: Persistent electrical noise suggests an internal component issue; the EasyControl should be replaced under warranty.