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This error message occurs when there is no connection between panel and CPU. Please check the following:
- Please open the panel from behind and check if the network cable is connected to the panel. If necessary, pull it out and plug it in again.
- Please disconnect the 24 pin connector from the machine and check with your thumb if the pins are all well seated.
- Please check the opposite part of the socket. If necessary, use contact spray and reconnect.
- Please open the electrical box and check whether the individual wires of the sockets are seated properly. It is best to wiggle and pull the wires carefully.
- Please open the electrical box and check if the network cable is connected to the CPU. If necessary pull out and plug in again.
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