Indoor unit shows F5; unit may stop in cooling or heating, especially under extreme outdoor temperatures.

Safety: Turn off power before servicing.

• Step 1 – Locate ambient sensor: On Senville outdoor units, the ambient sensor is usually near the air intake grille, not touching the coil.
• Step 2 – Check placement: Ensure it is not taped to hot surfaces or in direct sunlight. It should sense outdoor air temperature.
• Step 3 – Inspect wiring: Check for damage and reseat the connector on the PCB.
• Step 4 – Replace sensor: Install a new Senville outdoor ambient sensor if faulty.
• Step 5 – Test: Restore power and verify normal operation without F5.