E: A5.↓. Low Pressure Error (Outdoor Unit) - Fujitsu ASUH18LMAS Service Manual

Check point 6. Check the refrigerant amount
Check the refrigerant leakage.
Check point 7. Replace main PCB
If check point 1 to 6 do not improve the symptom, replace the main PCB.
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2-31. E: A5.↓. Low pressure error (Outdoor unit) 2. Troubleshooting with error code