F0 code appears; unit may not start compressor

Safety first: Turn off power before accessing the indoor electronics.

• Locate the room sensor: On SMEG wall units, the ambient sensor is usually clipped near the air intake or behind the front grille.
• Check connection: Ensure the sensor plug is firmly connected to the indoor PCB. Reseat if loose.
• Inspect wiring: Look for cuts or pinched wires along the sensor harness.
• Replace sensor if needed: If F0 persists, replace the ambient NTC sensor with the correct SMEG part, matching resistance specifications.

Sensor replacement is generally straightforward but ensure power is fully isolated before work.