CAT Controller Power Loss / Display Failure

Generator controller display is blank or unreadable, unit otherwise appears intact

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Blown controller fuse, Failed controller power supply, Loose display ribbon cable, Damaged display module

How to Fix / Troubleshooting

Safety: Disable automatic start and disconnect battery negative before opening the control panel.

  • Check fuses: Locate and test the low-voltage fuses feeding the controller. Replace blown fuses after identifying the cause.
  • Measure controller supply: Verify DC voltage at the controller power terminals. If absent, trace back to the battery and charger.
  • Inspect display connections: Carefully reseat any ribbon cables or connectors between the controller main board and the display.

If the controller still does not power up or the display remains blank, the controller or display module likely needs replacement by a CAT technician.

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Repair Difficulty

Hard 4/5

Required Part

Generator Controller Display Module
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