CPU Fault
Mitsubishi · D700 Inverter
What does E.CPU mean?
This fault indicates an internal communication fault within the inverter's built-in CPU. This is a critical internal error that causes the inverter output to stop, suggesting a potential hardware malfunction or severe internal interference. Such a fault can lead to complete loss of control and operation.
Complete Troubleshooting Guide
- 1
Check for devices producing excessive electrical noise around the inverter that could interfere with its internal electronics; implement noise reduction measures (e.g., proper grounding, shielding).
- 2
Ensure the inverter's operating environment is within specified conditions (temperature, humidity) to prevent internal component stress.
- 3
Power cycle the inverter (turn off, wait, then turn on) to attempt a soft reset of the CPU.
- 4
If the problem persists after troubleshooting environmental factors and power cycling, contact a sales representative for further diagnosis, as it may indicate an internal hardware failure.