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

Safety first: Turn off the unit at the breaker before opening the front panel. Avoid bending the aluminum fins on the coil.

Steps to check:

• 1. Clean air filters: Open the front grille of the indoor unit, remove the mesh filters, and wash them with mild detergent and lukewarm water. Let them dry completely before reinstalling.
• 2. Check for blocked airflow: Ensure that supply and return air are not blocked by curtains, furniture, or covers. Maintain at least 30–50 cm clearance around the indoor unit.
• 3. Inspect evaporator coil: With the front panel open, visually inspect the evaporator coil. If it is heavily clogged with dust, use a soft brush or vacuum with a brush attachment to gently clean the fins. Do not use sharp tools.
• 4. Check fan speed setting: Set the fan to HIGH and temperature to a moderate setting (e.g., 24 °C). Very low fan speed in a cold room can promote icing.
• 5. Sensor check (basic): Locate the T1 evaporator sensor clipped to the coil. Ensure it is firmly attached and not hanging loose. A loose sensor can misread coil temperature and trigger E2.

When to call a technician: If E2 persists after cleaning and airflow checks, low refrigerant or a faulty T1 sensor is likely. A licensed technician should check system pressures, leak-test, and replace the evaporator sensor if needed.