Fujitsu AUXG18KVLA Service Manual page 119

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.
2-35. E: A5. Low pressure error (Outdoor unit)
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2. Troubleshooting with error code