Error Name/Error Condition/Major Cause/Solution
interrupted after a normal startup.
• Controller stalled
• Board installed incorrectly
• Controller board (PCB15) defective
• Operation panel connector loose, broken, or defective
• Controller late
1. Turn the main power OFF/ON.
2. Check the connection of the operation panel.
3. Check the connection of the controller board (PCB15).
4. Replace the controller board (PCB15).
Error Name/Error Condition/Major Cause/Solution
Communication with the controller was interrupted after a normal startup.
• Controller stalled
• Board installed incorrectly
• Controller board (PCB15) defective
• Operation panel connector loose, broken, or defective
• Controller late
1. Turn the main power OFF/ON.
2. Check the connection of the operation panel.
3. Check the connection of the controller board (PCB15).
4. Replace the controller board (PCB15).
Error Name/Error Condition/Major Cause/Solution
The operation panel detects that the controller is down due to other reason, shown
in SC672-10, SC672-11, and SC672-12.
• Controller stalled
• Board installed incorrectly
• Controller board (PCB15) defective
• Operation panel connector loose, broken, or defective
• Controller late
1. Turn the main power OFF/ON.
2. Check the connection of the operation panel.
3. Check the connection of the controller board (PCB15).
4. Replace the controller board (PCB15).