Ferroli smart thermostat displays F01 and stops controlling heating; screen may still be on.

Safety first: Work only on the low‑voltage thermostat. Isolate power to the thermostat receiver before removing the room unit from its base.

• Power reset:
  • Remove the thermostat from its wall base (if it is a plug‑on type) or remove batteries if battery powered.
  • Wait 1–2 minutes, then refit and power up.
  • Check if F01 clears.
• Check for condensation or moisture:
  • Inspect the thermostat housing for signs of damp, condensation, or water ingress (often from a cold external wall).
  • If damp is present, relocate the thermostat to an internal wall away from drafts and moisture sources.
• Inspect mounting and wiring:
  • Ensure the thermostat is not mounted directly above a radiator or in direct sunlight, which can stress the sensor.
  • If there are low‑voltage wires to the thermostat, confirm they are firmly connected and not pinched.
• If F01 persists:
  • The internal NTC sensor is likely defective.
  • Replace the Ferroli smart room thermostat or have the PCB/NTC replaced by a service center.