Thermostat shows E11 and ignores commands from the Fibaro controller

Safety first: No high‑voltage work is required for this procedure.

Steps to troubleshoot E11 (communication timeout):

• 1. Check controller status:
  • Ensure the Fibaro Home Center or other Z‑Wave controller is powered on and functioning.
  • Verify that other Z‑Wave devices respond normally.
• 2. Check range and obstacles:
  • Confirm the thermostat is within reasonable range of the nearest Z‑Wave repeater or controller.
  • Metal cabinets, reinforced concrete, or mirrors can block signals; relocate repeaters if needed.
• 3. Heal or optimize network:
  • Use the controller's network heal/optimization function to rebuild routing tables.
  • Wait for the process to complete and then test communication.
• 4. Re‑include device:
  • If E11 persists, exclude the thermostat from the network and then include it again.
  • Recreate any scenes or associations involving the thermostat.
• 5. Update firmware:
  • Check for and apply any firmware updates for both the thermostat and the controller.

When to call a professional: For complex Z‑Wave networks with many nodes, a Fibaro integrator can analyze routing and interference issues more effectively.