My Gree AC cassette shows E6 intermittently. What could be causing this?

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My Gree AC cassette shows E6 intermittently. What could be causing this?
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Intermittent E6 errors suggest a loose connection or a component that is failing sporadically. Vibration from the unit's operation can exacerbate a loose connection. Carefully check all connections, especially the communication wiring, and consider replacing any suspect components. Environmental factors like temperature or humidity could also be contributing to the intermittent issue.