Bosch EasyControl shows error C8 and the display or touch interface is unresponsive or partially functional.

Safety first: Turn off power to the EasyControl before removing it from the wall plate. Do not touch live mains wiring.

• 1. Power cycle: Remove power for 60 seconds and restore. Observe whether the display and touch functions return to normal.
• 2. Reseat the unit: Gently remove the EasyControl from its wall plate (following the manual) and inspect the contact pins and pads for dirt or corrosion. Clean gently with a dry, lint-free cloth and re-seat firmly.
• 3. Check for damage: Look for cracks in the glass, signs of moisture inside the display, or impact marks. If present, the front assembly likely needs replacement.
• 4. Use the app: If the touchscreen is unreliable but the device is online, use the Bosch EasyControl app to adjust settings until the hardware can be repaired or replaced.

Professional help: If C8 persists and the display remains unresponsive after reseating and power cycling, the touchscreen assembly or main board is likely defective and should be replaced by Bosch service.