Indoor unit displays P5 and system may not operate in heating mode

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

Defective defrost sensor, Defrost cycle not initiating due to PCB fault, Low refrigerant charge, Outdoor fan issues causing coil to ice

Safety: Turn OFF power before working on the outdoor unit.

Step 1 – Inspect coil: Check for heavy ice buildup on the outdoor coil. If present, turn OFF the system and allow it to thaw completely.
Step 2 – Clean coil: After thawing, clean the coil to improve heat transfer.
Step 3 – Check fan operation: Ensure the outdoor fan runs properly in heating mode.
Step 4 – Sensor and PCB: If icing recurs and P5 persists, a technician should test the defrost sensor, reversing valve, and defrost control on the PCB.

Hard 4/5

Defrost Control Circuit (Outdoor PCB)

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