Haier · Ductless Split Air Conditioners
The indoor unit displays E2, indicating a problem with the heat-exchange sensor, which monitors the temperature of the coils.
Click steps to track your progress.
Turn off the AC unit at the main power supply, wait 5 minutes, and then turn it back on.
Check that air filters are clean and not restricting airflow over the heat exchanger.
If the issue persists, contact a qualified technician for inspection of the sensor.