Indoor unit displays E2 and cooling or heating stops; unit may run briefly then shut down.

Safety first: Turn off power at the breaker before opening the indoor unit.

Steps to try:

• Clean or replace filters: Open the front panel of the indoor head and remove the air filters. Wash with mild soap and water, dry completely, and reinstall. If damaged, replace.
• Inspect evaporator coil: With filters removed, inspect the indoor evaporator coil for heavy dust or ice. If iced, leave the unit OFF with the fan-only mode (if available) for several hours to thaw.
• Clean coil surface: Use a soft brush or coil cleaner designed for mini-split evaporators to gently clean the fins. Avoid bending fins.
• Check airflow: Ensure supply and return air are not blocked by furniture, curtains, or closed doors.

If E2 persists: Low refrigerant, a failing indoor fan motor, or a faulty evaporator temperature sensor (T1) may be involved. These require a technician for diagnosis and repair.