F1 error; unit may run fan only and not cool/heat properly

Safety first: Disconnect power before removing covers.

• Locate evaporator sensor: It is usually clipped onto the evaporator coil tubing near the center or side of the coil.
• Check mounting: Ensure the sensor is firmly attached to the coil surface for accurate readings.
• Inspect connector: Reseat the sensor connector on the indoor PCB and check for corrosion.
• Replace sensor: If F1 remains, install a new SMEG evaporator NTC sensor with the correct rating.

After replacement, clear the error by power cycling the unit.