E16
J+ Booster
Line/Neutral Polarity Error
Display shows E16; charger refuses to start and may mention line/neutral reversal.
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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
Reversed line and neutral in wall outlet, Miswired input terminal block on hardwired installation, Faulty polarity detection circuit on main control board, Use of non-standard adapter wiring with J+ Booster
How to Fix / Troubleshooting
Safety: Incorrect polarity can be hazardous. Do not attempt to correct fixed wiring unless you are a qualified electrician.
- Check adapters: Remove any third-party adapters or extension cords and plug directly into a known-good outlet.
- Test outlet wiring: Use a socket tester or have an electrician verify correct line/neutral orientation.
- Inspect hardwired connections (electrician only): If the J+ Booster is permanently wired, have an electrician confirm that L and N are correctly connected at the input terminal block.
- If polarity is correct but E16 persists: The polarity detection circuit on the main control board may be faulty and requires professional service.
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Repair Difficulty
Professional Required
5/5
Required Part
J+ Booster Input Terminal Block
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