InverterS300Verified · sol.ls-electric.com
S300 Main Fan Fault — Main Fan Fault
Alarm — operational, inspection needed
CAUSE
Why does it occur?
- Occurs when a fault is detected in the cooling fan
- It operates when the PRT-75 (MainFan Trip mode) code is set to 0 (Trip)
REMEDY · Step by step
How to fix it?
- Check the air inlet and outlet for foreign matter and clean them
- If the problem persists after cleaning, replace the fan
- If the alarm still occurs after replacing the fan, request inverter inspection
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Verified · sol.ls-electric.com
Open manual ↗S300 Standard User Manual V1.6 EN (260120)
9.5 Trip/Warning List · 14장 Troubleshooting · p.729 · V1.6 (2026-01-20)