Pulsar GFCI trip

How it presents

Symptom

Wallbox Pulsar trips GFCI/RCD during rain, wash-down, or cable handling. App/HMI shows ground-fault or protection trip; breaker may also open. Session will not restart until the protective device is reset and the moisture/insulation cause is cleared—not just the reset button mashed.

Root causes (by observed frequency)

1. #1 Moisture bridging GFCI sensing at cable gland, connector, or outdoor enclosure seam

   Most common after storms or pressure washing

2. #2 Damaged EV cable insulation or contaminated connector pins

   Inspect the full cable run, not just the connector end

3. #3 Site PE / bonding high resistance causing nuisance trips under load

   See protocol GND-01 before condemning the Wallbox board

4. #4 Failed GFCI module after repeated wet trips

   Replace only after a dry, known-good-cable retest still trips

Diagnostic procedure

1. 1. Photograph HMI/app fault, note outdoor exposure, and whether trip happens at plug-in or mid-session

   Expected: Exact fault string + weather context

   Tools: phone (scrubbed)

2. 2. LOTO feeder; dry cable, connector, and enclosure seams; inspect boots and glands

   Expected: No standing water; seals intact

   Tools: rags, inspection light

3. 3. Verify PE continuity at dispenser and panel bond before reset

   Expected: Low-ohm PE path per local code practice

   Tools: DMM / continuity

4. 4. Reset GFCI once; retry with known-good cable/vehicle if available

   Expected: Holds through authorize and ≥5 min charge

   Tools: known-good J1772 if on hand

5. 5. If still trips dry with known-good path, replace GFCI module per OEM—do not defeat protection

   Tools: OEM parts, torque list

The fix

Dry and seal the path, prove PE, then replace GFCI only if trips persist dry.

• GFCI / RCD module

  OEM Wallbox module only

  wallbox-pulsar-gfci

• Cable / connector assembly

  Replace if jacket or pins compromised

1. Lock out and tag out the branch circuit and verify zero energy before opening the enclosure.
2. Dry the enclosure, glands, and connector thoroughly, and replace any damaged cable boots found during inspection.
3. Confirm PE continuity and correct site bonding with a qualified electrician if it reads open or high-resistance.
4. Perform a single protective reset and validate the fix with a real session lasting at least five minutes.
5. If the trip recurs dry with a known-good path, replace the GFCI module, retest, and capture a scrubbed photo confirming the resolved status.