Fujitsu ASYG18KMTB - Unit Fails to Operate; Performance Issues (Cooling;Heating); Airflow Problems; Unusual Noises

Numbers in column Unit 1 to 4, and Total indicate the indoor unit capacities as follows:
7: 7,000 Btu/h, 9: 9,000 Btu/h, 12: 12,000 Btu/h, 14: 14,000 Btu/h ....
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1-1. Indoor unit connection patterns
1. Model lineup
4-5 UNIT MULTI-SPLIT TYPE 4-5 UNIT MULTI-SPLIT TYPE