Power Transistor Overheat

What does E51 mean?

The power transistor has overheated, indicating excessive heat generation, potentially due to a fault or overload condition. This protects the inverter from damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Measure the current draw of the compressor and compare to specification, checking for overload conditions.

2. 4

   Check for loose electrical connections within the inverter module's power circuit.