E54

Low/High Pressure Sensor Disconnection/Output Error

Mitsubishi Electric · Mitsubishi FR-D700 Inverter

What does E54 mean?

This error indicates a disconnection or output error with either the low-pressure sensor (PSL) (E54-1) or the high-pressure sensor (PSH) (E54-2). This prevents accurate pressure monitoring, jeopardizing system safety and control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Verify the wiring continuity from the sensors to the outdoor unit PCB, checking for breaks or short circuits.

Source: Mitsubishi FR-D700 Inverter
Open Manual (Page 5)