E41

Inverter Power Transistor Overheat

Mitsubishi Electric · Mitsubishi FR-D700 Inverter

What does E41 mean?

The power transistor for the inverter has overheated, indicating excessive heat generation, potentially due to a fault or overload condition. This poses a risk to the inverter module's longevity.

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.

Source: Mitsubishi FR-D700 Inverter
Open Manual (Page 4)