[Cause]
The system failed to communicate with the timer board.
[Countermeasure]
Note the second number in the displayed alarm message and report the contents to the service center. If the alarm message is IWC(DG) welding-controller communication error 100 (board number), check the DIP switch (T0, T1) settings on the timer board. For timer １, set T0=T1=0. If 2 boards are installed, set board 1 to T0=T1=0 and board 2 to T0=1,T1=0. If another alarm occurs, refer to its cause and countermeasures.