E20
FLO
Self-Test Failure of Safety Circuits
Charger indicates E20 / ‘EVSE Self-Test Failed’ at startup and will not charge.
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
Failed internal relay test, GFCI self-test failure, Isolation monitor self-test failure, Defective main control board
How to Fix / Troubleshooting
Safety first: Do not attempt to bypass self-tests. These protect against shock and fire hazards.
- Power-cycle: Turn OFF the breaker for 5 minutes, then ON, and observe if the self-test passes.
- Check for moisture: Inspect the exterior and cable for signs of water ingress. If water is suspected inside the unit, do not use it until inspected by a technician.
- Technician diagnostics: A qualified technician should run any available diagnostic routines (via service tool) to identify which self-test is failing (GFCI, isolation, relay, etc.).
- Component replacement: Replace the specific failed component (e.g., GFCI sensor module, main power contactor) or the entire main control board if the failure is on-board.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements