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Found error code U4 “Communication error” by using remote. Shut off power using breaker at disconnect. Checked all wiring connections. Restored power after approximately 5 minutes wait time. Checked system operations. Temperature split (68°F-97°F=29°F) Good Checked amp draw at outdoor unit. This particular error code can occur after a power outage. Walked through process of turning off indoor remote, shutting off power to system, waiting and then restoring power. System operating well at this time.