The indoor unit shows F8; the unit may limit capacity or shut down under heavy load.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Indoor PCB heat sink clogged with dust, poor airflow around the indoor electronics compartment, high ambient temperature near the indoor unit, or a faulty temperature sensor on the indoor PCB.

How to Fix / Troubleshooting

Safety first: Turn OFF power before removing the indoor unit cover. Avoid touching PCB components directly.

Step 1 – Clean intake and filters: Ensure filters and intake grilles are clean to reduce internal heat buildup.
Step 2 – Inspect PCB area: Remove the front cover and gently blow dust away from the PCB and heat sink using dry compressed air. Do not use liquids.
Step 3 – Improve room ventilation: Avoid enclosing the indoor unit in cabinets or soffits that trap heat.
Step 4 – Technician check: If F8 persists, a technician should verify the PCB temperature sensor and may need to replace the indoor main PCB.

Repair Difficulty

Medium 3/5

Required Part

Indoor Main PCB

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