E20
J+ Booster
Phase Loss / Phase Imbalance Detection
Charger shows E20; may indicate a phase detection or phase loss error on multi-phase models.
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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
One phase missing at supply due to breaker trip, Loose phase conductor in input terminal block, Faulty phase detection circuit on main control board, Incorrect wiring of three-phase supply to J+ Booster
How to Fix / Troubleshooting
Safety: Three-phase wiring must be handled by a qualified electrician.
- Check upstream breakers: Verify that all phase breakers feeding the J+ Booster are ON and not tripped.
- Do not open the charger: Internal phase connections are not user-serviceable.
- Have an electrician test supply: Confirm that all phases have correct voltage and are properly connected to the charger input terminals.
- If supply is correct but E20 persists: The phase detection circuitry on the main control board may be defective and needs replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
J+ Booster Input Terminal Block
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