F05000 Power Unit Heatsink Overtemp fault in siemens drive

F05000 Power Unit Heatsink Overtemp fault in siemens drive indicates that the temperature of the inverter power unit heatsink has exceeded the limit. 

Cause 
1. Ambient temperature too high.
2. Drive internal fan failed.
3. Air intake blocked. 

Remedy 
- Check cabinet ventilation. 
- Clean air filters. 
- Replace drive fan. 
- Ensure proper clearance around the drive.