How to troubleshoot high heat sink temperature on Lenze 9300 Controller?
- KKyle LewisAug 27, 2025
If the heat sink temperature of your Lenze Controller is higher than the set value, it could be due to a high ambient temperature (Tamb > 40 °C or 50 °C), a dirty heat sink, or an incorrect mounting position. Allow the controller to cool and improve ventilation. Check the ambient temperature in the control cabinet. Clean the heat sink and change the mounting position if necessary.










