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Inverter shows F10 auxiliary power fault

manufacturer says

Applies to: 5K-1P-N, 5K-2P-N, 8K-2P-N, 8K-2P-L, 12K (first generation, 2019 to 2021), 12K-2P-N, 12K-2P-LL Limitless, 15K-2P-N, 15K-2P-LV, 18K-2P-N, 18K-2P-LV

Symptoms

The inverter shows F10
The 2020 12K manual lists it as AuxPowerBoard_Failure and says to contact Sol-Ark
The Deye videos say a prolonged F10 most likely means the auxiliary power supply on the motherboard is damaged

Alerts and codes

F10

The cause and the fix

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Manufacturer documents

12K Indoor Legacy Model Installation User Manual 1