Thermostat shows E10 and cannot be configured or reset

Safety first: No mains wiring exposure is required if you do not remove the thermostat from the wall.

Steps to troubleshoot E10 (memory error):

• 1. Power cycle:
  • Turn off power at the breaker for 5 minutes.
  • Restore power and check if E10 clears.
• 2. Factory reset:
  • Follow the Fibaro thermostat manual to perform a full factory reset using the front panel buttons.
  • Be aware this will erase all settings and Z‑Wave inclusion.
• 3. Re‑include and reconfigure:
  • Use the Fibaro controller to add the thermostat back to the network.
  • Re‑enter schedules, temperature limits, and sensor settings.
• 4. Avoid power interruptions during updates:
  • If a firmware update is available, ensure stable power and do not switch off during the process.
• 5. Replace thermostat if error persists:
  • Persistent E10 after reset indicates a hardware memory fault; the thermostat should be replaced.

When to call a professional: For large Fibaro installations, a system integrator can verify if the issue is device‑specific or related to controller communication before replacing hardware.