06/2014
2-147
WC 5022/5024
123-314 UI Panel Communication Fail
Status Indicator RAPs
Version 1.0
123-314 UI Panel Communication Fail
BSD-ON: CH2.1
Communication failure between the ESS/MCU PWB and the UI Panel was detected.
Cause/Action
1. Turn the power OFF and ON.
2. Turn OFF the power and check the Flat Cable between the UI PWB J740 and the ESS/
MCU PWB J422 for open circuits, short circuits, and poor contacts.
3. If no problem is found, replace the following parts in sequence:
• UI PWB (PL 1.10)
• ESS/MCU PWB (PL 18.3)
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