Guardian Controller Power / Display Failure

Controller display is blank or unreadable; generator will not respond to commands.

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.

Possible Causes

Blown controller fuse, No DC power from battery, Failed display module, Internal controller failure

How to Fix / Troubleshooting

Safety first: Open the main breaker and disconnect the negative battery cable before removing controller covers.

Check battery voltage: Verify the battery is charged and connected.
Inspect controller fuse: Locate and test the low-voltage fuse feeding the controller. Replace if blown with the correct rating.
Connector check: Ensure the display ribbon cable and main harness plugs are fully seated on the controller board.
Controller replacement: If power and fuses are good but the display remains dead, replace the Guardian controller module.

Repair Difficulty

Medium 3/5

Required Part

Controller Display Module

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