Chapter 3: Fault finding – ECU faults
ZP3-ECU Extinguishing Control Unit Maintenance Manual
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Status unit fault
Indications
• The indicating LEDs that should display on the status unit are not illuminating.
• Operation of controls on the status unit does not evoke appropriate response
on the ECU.
Possible causes
• The wiring connections to the status unit are open circuit or incorrect.
• The ribbon cable connected from the status unit main board to the sdisplay
board is loose.
Corrective actions
Inspect and/or rectify terminal wiring and/or ribbon cable connection. Once
corrected, the unit will respond appropriately.
