Indoor unit displays F5; system may shut down during heating or cooling; sometimes linked to low or high pressure protection.

Safety: Refrigerant systems are sealed and under pressure. Do not open the refrigerant circuit without proper certification and tools. Always turn off power before inspection.

Steps:

• 1. Check airflow: Ensure indoor filters are clean and not blocked. Clean or replace filters if dirty.
• 2. Inspect outdoor coil: Check the condenser coil for dirt, leaves, or obstructions. Gently clean with a soft brush or low-pressure water, avoiding bending fins.
• 3. Verify fan operation: Confirm that both indoor and outdoor fans run when the unit is on. If a fan is not running, address that fault first.
• 4. Look for icing: Inspect the indoor coil for ice buildup. If present, turn the unit off and let it thaw completely before further use.
• 5. Professional refrigerant check: If F5 persists after airflow issues are corrected, a certified technician must check system pressures, refrigerant charge, and pressure sensors/switches. Leaks must be located and repaired, then the system evacuated and recharged according to Airwell specifications.