Sol-Ark › IGBT power stage, heatsink and cooling fans

Inverter shows F64 heatsink high temperature

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, 30K-3P-208V, 60K-3P-480V

Symptoms

The inverter shows F64 Heatsink_HighTemp_Fault
Either the environment really is hot or badly ventilated, or the back-end temperature sampling data is abnormal while the environment is normal

Alerts and codes

F64

The cause and the fix

Subscribers see the cause, the fixes that worked and who did them, part numbers and recent prices when a part is involved, and the field reports behind this entry.

Subscriber access is opening soon.

Manufacturer documents

15K Installation Manual Rev 13 16July2026