Unit stops and displays E8; may be accompanied by reduced airflow and ice on indoor coil.

Safety first: Turn off the unit at the breaker to allow any ice on the coil to melt. Place towels under the unit if dripping is expected.

Steps to try:

• Clean or replace filters: Remove and wash reusable filters with mild soap and water. Let them dry completely before reinstalling. Replace disposable filters.
• Inspect evaporator coil: With the front cover off, check the coil for dust and lint. Use a soft brush and coil cleaner approved for aluminum fins.
• Check indoor fan speed: Ensure the fan is set to an appropriate speed and that the blower is actually running at that speed.
• Allow full thaw: Leave the unit off for several hours until all ice has melted, then restart in fan-only mode for 30 minutes before cooling.

When to call a technician: If E8 recurs with clean filters and good airflow, a technician should check refrigerant charge and the evaporator sensor.