OpenEVSE
Short Circuit or Severe Overcurrent on Output
EVSE trips the upstream breaker immediately when starting a charge, but shows no specific error code.
Advertisements
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.
Advertisements
Possible Causes
Shorted J1772 cable conductors, Miswired contactor output, Contactor with internal short, Incorrect breaker size or type
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset a breaker that trips instantly; this indicates a serious fault.
- Step 1 – Visual inspection: With power OFF, inspect the J1772 cable and internal wiring for obvious shorts, melted insulation, or pinched wires.
- Step 2 – Isolation test: Disconnect the J1772 cable from the contactor output and try energizing the EVSE without a vehicle connected. If the breaker no longer trips, the cable is likely shorted and should be replaced.
- Step 3 – Contactor test: With the cable disconnected, measure resistance across the contactor output terminals. A near-zero reading when open indicates an internal short; replace the contactor.
- Step 4 – Verify breaker rating: Ensure the breaker size matches the EVSE's maximum current and that it is a proper type (e.g., 2-pole for 240 V).
Advertisements
Repair Difficulty
Hard
4/5
Required Part
J1772 Charge Cable Assembly
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements