E22

CPU Communication Error

Omron · MX2 Inverter

What does E22 mean?

This fault occurs when there is a communication failure between the two internal CPUs within the inverter. Such a failure prevents coordinated operation and leads to an inverter trip, indicating a critical internal control issue.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Ensure the inverter's firmware is up to date and compatible with its hardware versions.

  2. 4

    If the error persists after basic troubleshooting, it indicates an internal hardware malfunction; contact Omron technical support for repair or replacement.

Source: Omron MX2 Inverter
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