E14
Heidelberg
Low‑Voltage Power Supply Instability
Charger shows E14, display or LEDs may flicker, unit 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
Failing auxiliary SMPS on main board, Loose low‑voltage connectors, Short circuit on peripheral board (RFID, display, comms), Overloaded 12 V or 5 V rail due to add‑on modules
How to Fix / Troubleshooting
Safety first: Isolate mains before opening the charger. Low‑voltage circuits are still part of the safety system.
- 1. Visual inspection:
- Open the housing and inspect the auxiliary power supply section on the main board for bulging capacitors or burn marks.
- 2. Reseat connectors:
- Disconnect and reconnect low‑voltage harnesses to display, RFID, and communication modules.
- Ensure no pins are bent or pushed out of the connector housing.
- 3. Remove optional modules:
- If additional modules (e.g., external meter interface) are installed, temporarily disconnect them.
- Power up and see if E14 disappears, indicating an overloaded rail.
- 4. Measure low‑voltage rails (qualified personnel):
- With the charger powered, carefully measure 5 V and 12 V rails at test points.
- Significant fluctuation or low voltage indicates a failing SMPS.
- 5. Replace main board if needed:
- If the auxiliary supply is unstable, replace the main control board as a complete unit.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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