E39

Compressor Discharge Temperature Sensor (ThOD) Defective / Poor Connection

Mitsubishi Electric · Mitsubishi FR-D700 Inverter

What does E39 mean?

The compressor discharge temperature sensor (ThOD) is defective (open circuit resistance) or has a poor connection on the outdoor unit PCB. This can lead to incorrect discharge temperature monitoring, potentially causing compressor damage.

Source: Mitsubishi FR-D700 Inverter

Open Manual (Page 4)