Fault Code 1683
Cummins
High DC Supply Voltage
Controller displays Fault Code 1683 – High Battery Voltage; possible DC alarms and controller protection shutdown
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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
Battery charger overvoltage, Incorrect charger settings or wrong charger model, Loose battery connection causing voltage spikes, Failed voltage regulator in charger
How to Fix / Troubleshooting
Safety first: Disable automatic start and isolate AC power feeding the battery charger before servicing it.
- Measure DC voltage: With a multimeter at the battery, confirm actual voltage. For a 12 V system, sustained voltage above ~14.5 V is excessive.
- Inspect charger: Locate the Cummins battery charger module. Check for incorrect selector settings (battery type/voltage) if adjustable. Ensure the charger model matches the system voltage.
- Connections: Tighten all DC output terminals on the charger and battery. Loose connections can cause erratic readings.
- Replace charger if needed: If voltage remains high with correct wiring and settings, the charger’s internal regulator may have failed. Replace with a Cummins-approved charger of the same rating.
- Reset: After stabilizing voltage, clear the fault and monitor DC voltage over several hours.
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Repair Difficulty
Medium
3/5
Required Part
Battery Charger
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