The C1 error code on a Samsung digital inverter AC usually indicates a communication error between the indoor and outdoor units. This could be caused by a faulty control board or a wiring issue.
To troubleshoot this issue, you can try resetting the unit by turning off the power supply for a few minutes and then turning it back on. If the error persists, you may need to call a professional technician to diagnose and fix the issue. They may need to check the wiring connections and replace any faulty parts if necessary.
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