- Solar and energy
- Solar inverter
VE.Bus Error 11
Victron inverter VE.Bus Error 11: internal AC relay test fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
VE.Bus Error 11 (Relay Test Fault) on a Victron MultiPlus-II or EasySolar-II means the automatic self-test of the internal AC backfeed relays failed before connecting to the grid. Record the Error 11 report on your GX device and have a qualified electrician inspect the AC wiring.
Safety first
Stop and check this first
- Never open the product casing or touch bare terminals: the MultiPlus-II manual warns that dangerous residual voltages may still exist inside the product and at its terminals after shutdown.
- Do not alter neutral-to-earth bonding or bypass the earth leakage circuit breaker on the AC output yourself.
Safe checks you can perform
- Read the 'VE.Bus Error 11 report' on your GX device menu
- Check whether commissioning or AC wiring changes preceded the fault
- See whether the unit auto-restarts once the external condition clears
Leave these tasks to a qualified professional
- Do not attempt this professional task: AC input polarity, earthing, and disconnected AC-out isolation test
- Do not attempt this professional task: VE.Bus firmware update to v455+ and VEConfigure grid-code neutral setting check
What a technician must be able to justify
Technician visit
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.
AC input polarity, earthing, and disconnected AC-out isolation test
What they doThe electrician verifies Line and Neutral polarity on AC-in, checks that Earth is not bonded to Neutral inside the MultiPlus-II, and re-runs the relay test with all external AC-out wiring disconnected.
They must show youthe GX Error 11 report passing steps 9, 8, and 7 and the measured voltages between Line, Neutral, and Earth.
In writingthe measured L-N, L-PE, and N-PE voltages, the failing step recorded before repair, and the wiring correction made.
VE.Bus firmware update to v455+ and VEConfigure grid-code neutral setting check
What they doUsing an MK3-USB interface, the technician updates VE.Bus firmware to the latest release (at least v455, or v466+ where 'Neutral path externally joined' is required) and verifies grid-code compliance settings.
They must show youthe updated VE.Bus firmware version and the configured grid-code settings in VEConfigure or VictronConnect.
In writingthe installed VE.Bus firmware version, selected grid-code options, or the GX report details for warranty replacement.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Read the 'VE.Bus Error 11 report' on your GX device menu
- Who:
- you, checking the connected GX device screen (such as a Cerbo GX) or Remote Console on VRM.
- How:
- with VE.Bus firmware 454+ and Venus OS v2.23+, open MultiPlus -> Alarm Status -> VE.Bus Error 11 report and write down the 6-digit number and failing step (the test counts backwards 9 -> 8 -> 7).
- Result that matters:
- giving your technician the exact failing step number (for instance, Failing step 8 points to swapped Line and Neutral input wires).
- If the GX menu displays the 6-digit report and failing step:
- take a clear photo of the screen.
- If no GX device is installed:
- note the phase-opposition flashing of the 'inverter on' LED against the 'bulk', 'absorption', and 'float' LEDs.
- Evidence to keep:
- a photo of the GX 'VE.Bus Error 11 report' screen or a clip of the front panel LEDs.
Evidence: VE.Bus Error Codes · MultiPlus-II 230V Rev 14 - 07/2026
Check whether commissioning or AC wiring changes preceded the fault
- Who:
- you, reviewing recent electrical work without opening any enclosures.
- How:
- check whether VE.Bus Error 11 started right after initial installation, distribution board work, or plugging a new load into the AC-out-1 or AC-out-2 circuits.
- Result that matters:
- helping the electrician narrow down whether reversed input polarity, neutral bonding, or load leakage is involved.
- If the fault appeared right after wiring work or adding an AC load:
- let your electrician know before they test the unit.
- If nothing changed in the installation prior to the alarm:
- report that as well so the technician checks firmware and relays.
- Evidence to keep:
- notes on any recent electrical work or appliances connected to the AC outputs.
Evidence: VE.Bus Error Codes · MultiPlus-II 230V Rev 14 - 07/2026
See whether the unit auto-restarts once the external condition clears
- Who:
- you, watching the GX display or front LEDs without touching AC or DC terminals.
- How:
- Victron notes that VE.Bus Error 11 auto-restarts once gone; observe whether the inverter/charger completes the relay test and reconnects to the mains on its own.
- Result that matters:
- distinguishing a transient mains disturbance from a permanent wiring or relay fault.
- If the error clears automatically and AC mains operation resumes:
- keep the GX report photo in case it returns.
- If Error 11 remains active and the unit stays off-grid:
- leave the enclosure closed and call your Victron installer.
- Evidence to keep:
- VRM alarm log timestamps showing when Error 11 triggered and whether it persisted.
Evidence: VE.Bus Error Codes
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Victron Energy
- Product type
- Solar inverter
Known code variants
- Código de error VE.Bus 11
- Error 11 VE.Bus
- Fallo de prueba de relé VE.Bus 11
- MultiPlus-II Error 11
- MultiPlus-II VE.Bus Error 11
- Relay Test Fault
- VE.Bus Code 11
- VE.Bus Error 11 Relay Test Fault
What it means
In the official Victron Energy VE.Bus error reference and MultiPlus-II 230V manual, VE.Bus Error 11 ('Relay Test Fault') signals that the automatic self-test of the internal backfeed relays failed before connecting to the mains with a grid code selected in VEConfigure. Victron lists wiring or earthing mistakes (earth bonded to neutral inside the unit, leakage on AC-out, external AC-in to AC-out neutral link without enabling the matching grid-code option, or swapped Line and Neutral on AC-in showing 'Failing step: 8'), firmware older than v455, or a defective relay. The error code alone never proves the internal relay is broken.
Warnings and stop conditions
- Highsource verified
Never open the product casing or touch bare terminals: the MultiPlus-II manual warns that dangerous residual voltages may still exist inside the product and at its terminals after shutdown.
Evidence: MultiPlus-II 230V Rev 14 - 07/2026
- Highsource verified
Do not alter neutral-to-earth bonding or bypass the earth leakage circuit breaker on the AC output yourself.
Evidence: VE.Bus Error Codes · MultiPlus-II 230V Rev 14 - 07/2026
Symptoms and causes
Probable causes · in order
- Line and Neutral input wires swapped or improper earthing inside the unitCommon
Victron states that swapping Line and Neutral on the AC input causes the relay test to stop at 'Failing step: 8', and connecting Earth to Neutral inside the unit also triggers Error 11.
Evidence: VE.Bus Error Codes · MultiPlus-II 230V Rev 14 - 07/2026
- Leakage on AC-out wiring or unconfigured external Neutral-to-Earth linkCommon
Leakage between load, neutral and ground on AC-out, or an external connection between AC-in Neutral and AC-out Neutral/Earth without enabling the 'Neutral path externally joined' grid-code option, fails the self-test.
Evidence: VE.Bus Error Codes
- VE.Bus firmware older than v455 or internal backfeed relay failurePossible
Firmware versions prior to v455 could raise Error 11 due to AC0/AC1 mismatch and UMains errors, or an internal backfeed relay has physically failed and the unit needs replacement.
Evidence: VE.Bus Error Codes
Virtual technician
Does VE.Bus Error 11 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
Victron Energy · 2024 · official_doc
- 2
MultiPlus-II 230V Rev 14 - 07/2026
Victron Energy · 2026 · manual
- 3
Manual MultiPlus-II 230V Rev 14 - 07/2026
Victron Energy · 2026 · manual
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