CHARGER FAIL
Guardian
Integrated Battery Charger Failure
Controller shows CHARGER FAIL or BATTERY CHARGER FAULT; battery may not stay charged between exercises.
Advertisements
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.
Advertisements
Possible Causes
Failed internal battery charger board, Blown charger fuse, No AC utility power to charger circuit, Loose charger wiring harness
How to Fix / Troubleshooting
Safety first: Turn the controller to OFF and open the main breaker. Disconnect the negative battery cable before servicing charger wiring.
- Verify utility power: Confirm that the Guardian generator has normal utility AC power feeding the charger circuit. Check the house breaker feeding the generator.
- Inspect charger fuse: Locate the battery charger fuse in the control panel. Replace if blown with the exact same rating.
- Check wiring harness: Ensure the charger output leads are firmly connected to the battery terminals and that the harness plug is fully seated on the control board.
- Measure charger output: Reconnect the battery, restore AC, and measure voltage at the battery with the unit off. If voltage does not rise above static battery voltage, the charger module is likely defective.
- Replace charger module: Remove and replace the Guardian battery charger/control board assembly as specified in the service manual, or have a qualified technician perform the repair.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Battery Charger / Control Board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements