Fixing a ductless mini-split air conditioning system displaying an E1 error code requires resolving the underlying indoor-to-outdoor communication fault or sensor mismatch. First, shut off the main electrical power to both the indoor and outdoor units at the circuit breaker panel to ensure complete safety. Second, remove the front cover of the indoor wall cassette and the service panel of the outdoor condenser to inspect the low-voltage communication wire terminals (typically labeled 1, 2, 3, or S). Check for loose screws, oxidized wire contacts, or chewed cables. Third, re-strip and secure any loose wires firmly into their correct terminals. Fourth, perform a hard system reboot by leaving power disconnected for ten minutes. You can troubleshoot electrical integrity with a multimeter. You can verify that your repair was successful when powering the system back on clears the E1 fault code and allows normal operation.
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