- EV charging
- EV charger
103
Wallbox 103: DC leakage was detected and may originate in the vehicle OBC, charger or electrical installation
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
103 means DC leakage was detected and may originate in the vehicle OBC, charger or electrical installation in the cited charger family. The deciding observation is whether 103 returns immediately after the documented disconnect/restart/reconnect sequence. Do not infer a failed part from the code alone.
Safety first
What to do now
- Capture the exact charger, vehicle and pattern
Photograph 103 and record the Wallbox model, part/serial number, vehicle model, cable used, charge stage and approximate time. Do not clear the event before those facts are saved.
- Run the one deciding check
Disconnect the vehicle, inspect only for visible damage or water, restart the charger once and reconnect only if the connector and area are dry and undamaged. Record whether 103 returns immediately after the documented disconnect/restart/reconnect sequence. Change one condition only.
- Use recurrence as the stop point
If charging resumes, the protection cleared on this attempt, but the event still does not locate the leakage source; preserve the code and vehicle identity. If 103 returns, stop charging. The code explicitly leaves three competing electrical sources and cannot justify replacing the charger or vehicle OBC.
What you must never do
- Do not attempt this professional task: Measured handoff for 103
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured handoff for 103
What they doMeasure DC leakage and insulation in a controlled sequence that separates vehicle OBC, charge point and fixed installation; record which boundary reproduces the trip.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- EV charging
- Brand
- Wallbox
- Product type
- EV charger
Known code variants
- 103 Early Hints
- 103 Frühe Hinweise
- 103 Indications préliminaires
- 103 Indicios anticipados
- 103 Suggerimenti preliminari
- cargador Wallbox 103
- caricatore Wallbox 103
- chargeur Wallbox 103
- code Wallbox 103
- codice Wallbox 103
- código Wallbox 103
- erreur Wallbox 103
- error Wallbox 103
- errore Wallbox 103
- événement Fronius 103
- événement SMA 103
- evento Fronius 103
- evento SMA 103
- Fronius Ereignis 103
- Fronius event 103
- Fronius inverter 103
- Fronius Symo / Eco 103
- Fronius Wechselrichter 103
- HTTP 103
- HTTP status 103
- inversor Fronius 103
- inversor SMA 103
- inverter Fronius 103
- inverter SMA 103
- onduleur Fronius 103
- onduleur SMA 103
- SMA Ereignis 103
- SMA event 103
- SMA inverter 103
- SMA Wechselrichter 103
- Sunny Tripower X 103
- Wallbox app code 103
- Wallbox charger 103
- Wallbox error 103
- Wallbox Fehler 103
- Wallbox Fehlercode 103
- Wallbox Ladegerät 103
What it means
Wallbox’s official documentation defines 103 as DC leakage was detected and may originate in the vehicle OBC, charger or electrical installation. That is the protection or controller state, not a universal component diagnosis. If charging resumes, the protection cleared on this attempt, but the event still does not locate the leakage source; preserve the code and vehicle identity. If 103 returns, stop charging. The code explicitly leaves three competing electrical sources and cannot justify replacing the charger or vehicle OBC.
Warnings and stop conditions
- Criticalsource verified
Smoke, burning smell, sparks, water, visible damage, abnormal heat or repeated protective-device trips means stay clear and leave charging disabled. Never open the charger, panel or connector and never probe voltage yourself.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
Sources and technical references
- 1
Understanding Wallbox app Error Codes and How to Resolve Them
Wallbox · 2025 · official_doc
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