The E90 error code is not a specific code. The error code E90 is just a group error code. It is indicating a communication error between the two boards in your machine. It does not indicate where the problem may be. A power glitch may have caused the E90 error code or a loose connection. One of the control boards could have failed. If it did not clear by unplugging the washer, I recommend a technician come out to properly diagnose your washer
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