Heatsink Overheat

What does E.FIN mean?

This fault indicates that the inverter's internal heat sink has exceeded its safe operating temperature, triggering a temperature sensor and shutting down the inverter output. This usually happens when the ambient temperature is too high, the heat sink is blocked by debris, or the cooling fan is not functioning correctly. Sustained overheating shortens the lifespan of inverter components and can lead to permanent damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the cooling fan for proper operation (e.g., rotation, noise) and correct installation orientation; replace the fan if it is faulty or worn out.