E20
Leviton
Line Frequency Out of Range
Charger indicates E20 or a line frequency error; unit refuses to charge even though voltage appears normal.
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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
Abnormal utility frequency, Generator or inverter supply not providing stable 60 Hz, Faulty frequency detection circuit on control board, Electrical noise on supply lines
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before any internal work. Only a qualified electrician should measure live frequency.
Steps:
- 1. Identify power source: If the EVSE is powered from a generator or inverter, verify that it is rated for EV charging and provides a stable 60 Hz output.
- 2. Measure frequency: Have an electrician measure line frequency at the EVSE input using a meter with frequency function. Compare to the acceptable range in the Leviton manual.
- 3. Correct supply issues: If frequency is unstable, adjust or replace the generator/inverter or switch to utility power.
- 4. Internal fault: If frequency is normal but E20 persists, the frequency detection circuit on the main board may be defective and require board replacement.
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Repair Difficulty
Hard
4/5
Required Part
Leviton EVSE Main Control Board
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