- EV charging
- EV charger
104
Wallbox 104: the control-pilot circuit used for vehicle communication reported a fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
104 means the control-pilot circuit used for vehicle communication reported a fault in the cited charger family. The deciding observation is whether the same vehicle reaches handshake/charging after one full power-off and restart. Do not infer a failed part from the code alone.
Safety first
Stop and check this first
- Do not open the charger, vehicle connector or electrical panel, and do not probe live contacts. Stop if there is water, damage, heat, burning smell, sparking or a repeated protective-device trip.
Safe checks you can perform
- Capture the exact charger, vehicle and pattern
- Run the one deciding check
- Use recurrence as the stop point
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured handoff for 104
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 104
What they doMeasure control-pilot states through connection and charge request, then separate vehicle inlet/cable behaviour from charger CP generation before replacing hardware.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Capture the exact charger, vehicle and pattern
No special tools
Procedure
Photograph 104 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.
Do not open the charger, vehicle connector or electrical panel, and do not probe live contacts. Stop if there is water, damage, heat, burning smell, sparking or a repeated protective-device trip.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
- 2
Run the one deciding check
No special tools
Procedure
Switch off the charger, unplug the vehicle, check the connector for visible damage, restart once and retry the same charge. Record whether the same vehicle reaches handshake/charging after one full power-off and restart. Change one condition only.
Do not open the charger, vehicle connector or electrical panel, and do not probe live contacts. Stop if there is water, damage, heat, burning smell, sparking or a repeated protective-device trip.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
- 3
Use recurrence as the stop point
No special tools
Procedure
A completed handshake supports a transient connection/communication state, not a proven control-pilot component failure. If 104 returns at the same stage, stop repeating restarts and preserve the vehicle, cable and LED state for the communication-path test.
Do not open the charger, vehicle connector or electrical panel, and do not probe live contacts. Stop if there is water, damage, heat, burning smell, sparking or a repeated protective-device trip.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
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
- cargador Wallbox 104
- caricatore Wallbox 104
- chargeur Wallbox 104
- code Wallbox 104
- codice Wallbox 104
- código Wallbox 104
- erreur Wallbox 104
- error Wallbox 104
- errore Wallbox 104
- Wallbox app code 104
- Wallbox charger 104
- Wallbox error 104
- Wallbox Fehler 104
- Wallbox Fehlercode 104
- Wallbox Ladegerät 104
What it means
Wallbox’s official documentation defines 104 as the control-pilot circuit used for vehicle communication reported a fault. That is the protection or controller state, not a universal component diagnosis. A completed handshake supports a transient connection/communication state, not a proven control-pilot component failure. If 104 returns at the same stage, stop repeating restarts and preserve the vehicle, cable and LED state for the communication-path test.
Warnings and stop conditions
- Highsource verified
Do not open the charger, vehicle connector or electrical panel, and do not probe live contacts. Stop if there is water, damage, heat, burning smell, sparking or a repeated protective-device trip.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
Symptoms and causes
Probable causes · in order
- What the manufacturer code establishesConfirmed
Wallbox documents 104 as a state in which the control-pilot circuit used for vehicle communication reported a fault. Keep this meaning scoped to the cited charger family and exact light/code pattern.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
- What the result changes — and what it does not provePossible
A completed handshake supports a transient connection/communication state, not a proven control-pilot component failure. If 104 returns at the same stage, stop repeating restarts and preserve the vehicle, cable and LED state for the communication-path test.
Evidence: Understanding Wallbox app Error Codes and How to Resolve Them
Virtual technician
Does 104 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Understanding Wallbox app Error Codes and How to Resolve Them
Wallbox · 2025 · official_doc
Was this entry useful?