E15
Schumacher
Low-Voltage Power Supply Fault
Display shows E15; charger may not power up fully or may reboot repeatedly.
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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
Failed internal AC‑DC auxiliary power supply, Shorted component on control board, Loose low-voltage harness, Surge damage to power supply
How to Fix / Troubleshooting
Safety first: Turn OFF the breaker and wait several minutes before opening the unit. Internal capacitors may hold charge.
- Check line power: Confirm the breaker is ON and supplying correct voltage to the charger input.
- Observe startup: If the display flickers or the unit clicks repeatedly, the low-voltage supply may be cycling due to overload or failure.
- Internal inspection (qualified only): Look for bulged capacitors, burn marks, or a burnt smell near the auxiliary power supply section. If present, the power supply board or control board must be replaced.
- Do not attempt board-level repair: Replace the entire board assembly per Schumacher service procedures.
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Repair Difficulty
Professional Required
5/5
Required Part
Auxiliary Power Supply Board
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