6. Troubleshooting
6.1. LEDs, Warnings, Alarms & Error Codes
LEDs
The battery is equipped with two indicator LEDs: the Bluetooth Status LED and the Error LED. These LEDs indicate the current operating state of the battery and signal any warnings or faults. |  |
The following tables list all LED indications and their meanings.
Bluetooth Status LED | Description |
|---|---|
Off | The battery is switched, or Bluetooth is disabled in the VictronConnect app. |
Blue on | A Bluetooth device is connected. |
Blue blinking | Bluetooth is active but no device is connected. |
Error LED | Description |
|---|---|
Off | No warning/alarm/error active. |
Red blinking | A warning is active. |
Red on | An alarm and/or error is active. |
During a firmware update, the Bluetooth and Error LEDs blink simultaneously, indicating that the update is in progress.
Warnings, Alarms & Error Codes
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Warning codes
VictronConnect warning code | Message | Instructions / Remarks |
|---|---|---|
W-B01 | Low cell voltage | Charge the battery or reduce the load to prevent an imminent system shutdown. |
W-B02 | High current | Reduce the current to prevent an imminent system shutdown. Do this byreducing the load or by turning loads off. |
W-B06 | Load will disconnect | The loads will be turned off after 30 seconds if the fault is not resolved, for example due to low battery voltage. This warning is always shown together with the reason for the impending load disconnection. |
W-B07 | Low SoC | Charge battery or reduce load to prevent imminent system shutdown. |
W-B11 | Cellguard Firmware cannot be updated | Follow recovery document (cellguard could not enter bootloader mode and needed a powercycle) |
Alarm codes
VictronConnect alarm code | Message | Instructions / Remarks |
|---|---|---|
A-B01 | Low cell voltage | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B02 | High current | Reduce charging current or turn off some loads. The system will try to reenable chargers or loads in 5 minutes. |
A-B03 | High BMS temperature | |
A-B06 | Load disconnected | The loads have been turned off via the ATD contact. Resolve this alarm by charging the battery. If not resolved, eventually the contactor will open and the DC system will be disconnected. |
A-B07 | Low SoC | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B08 | Low bank voltage | Charge battery. The system will turn the loads back on when the battery is sufficiently charged. |
A-B09 | High battery temperature | The battery temperature is too high for charging. Try to reduce the ambient temperature. |
A-B13 | Low battery temperature | Try to increase the ambient temperature. |
Error codes
VictronConnect error code | Message | Instructions / Remarks |
|---|---|---|
E-B11 | Hardware error | Contact your Victron dealer. |
E-B25 | Pre-charge error | The load resistance is too low to pre-charge the loads. Disconnect or reduce some DC loads. |
E-B35 | Pre-charge timeout | The load capacity is too high to pre-charge. Disconnect some DC loads. |
E-B36 | ATC/ATD failure | Check ATC/ATD wiring and make sure that all loads and chargers are controlled by ATC or ATD. |
E-B42 | High cell voltage | |
E-B43 | External disconnection signal | SuperPack extern signal triggered. |
E-B44 | Battery safety lock | Active when a cell voltage is below 1.85V for more then 30 seconds. Both charging and discharging are disabled in this case. Can only be reset by a power-cycle. |
E-B116 | Calibration lost | Contact your dealer. |
E-B119 | Settings data lost | Settings data is corrupt. Go to the settings page and reset to defaults. |
6.2. Self-restoring protection mechanisms
The SuperPack NG battery includes several protection mechanisms that automatically disable charging and/or discharging when unsafe conditions are detected. In most cases, the battery attempts to recover automatically once the condition is removed. This section explains the behaviour of these self-restoring protections and when manual intervention is required.
Short circuit protection
A short circuit is detected and interrupted by the hardware protection. When this occurs, the firmware attempts to recover automatically by performing a pre-charge sequence.
The battery performs up to three pre-charge attempts, with a 30-second pause between each attempt.
If, after three attempts, the short-circuit condition is still present and the output voltage does not rise, a pre-charge error (E-B25) is raised. In this state, both charging and discharging are disabled.
If the short-circuit condition is later removed (the load voltage drops below the defined threshold), charging and discharging are automatically re-enabled.
If, during the recovery attempts, the output voltage does rise but normal operation cannot be fully restored, a pre-charge timeout is raised. In this case, discharging is disabled while charging remains allowed.
After a pre-charge timeout, the battery waits 10 minutes before repeating the pre-charge sequence (three attempts). This cycle is repeated automatically until the output can be enabled again.
Overcurrent protection
If an overcurrent condition is detected during charging or discharging, the affected action is disabled immediately.
After a delay of up to 5 minutes, charging or discharging is automatically re-enabled. If an overcurrent condition is detected again, the same process is repeated.
There is no permanent lockout for overcurrent protection. The battery will continue to disable and re-enable charging or discharging in 5-minute cycles until the overcurrent condition is resolved.
Low-voltage safety lock-down
If a cell voltage drops below 1.85 V, a low-voltage pre-alarm (W-B01) is raised.
After 30 seconds, discharging is disabled and a low-voltage alarm (A-B01) is raised. After a further 30 seconds, charging is also disabled and a Battery Safety Lock error (E-B44) is triggered.
Important
This condition is not self-restoring. Recovery is only possible by performing a full power cycle of the battery after the underlying cause has been resolved.
6.3. ATC / ATD off-reasons in VictronConnect
When Allow To Charge (ATC) or Allow To Discharge (ATD) is inactive, VictronConnect displays a specific off-reason explaining why charging or discharging is currently disabled.
The off-reason can be viewed by tapping the circled “i” icon shown next to the ATC or ATD status when it indicates “No”.
Off-reasons can result from internal battery protection mechanisms, configuration settings, temperature limits, remote control inputs, or system error conditions. Each off-reason is accompanied by a short description and, where applicable, guidance on corrective actions.
Depending on the condition, an off-reason may apply to ATC, ATD, or both. Reviewing the off-reason helps determine whether the restriction is temporary, configuration-related, or caused by a protection or fault condition, and supports correct troubleshooting.
The following table provides an overview of all possible ATC and ATD off-reasons as shown in VictronConnect.
VictronConnect off-reason | Description | Advice | Trigger condition | ATC | ATD |
|---|---|---|---|---|---|
Disabled by battery | Battery prevents [charging | discharging]. This may occur if there is no communication with the battery (yet) or if the battery configuration is invalid. | No battery communication Invalid battery configuration Invalid battery voltage | Yes | Yes | |
High temperature | The temperature is too high. This is a part of the battery protection mechanism and it is not necessarily indicating a problem. | Check the ambient temperature and/or whether the fans are running. | FET temperature too high Cell overtemperature | Yes | Yes |
Remote H/L switch open | Disabled via Remote on/off input. | Based on the ‘Battery settings’, check whether the H/L wires are tied together and are connected to VCC and GND, respectively, or, if they are connected properly to the BMS. In this case, no action is required. | REMOTE input disconnected | Yes | Yes |
Internal reason | The device is in alarm state and it is preventing normal operation. | Check the alarm notifications and take the appropriate actions to clear it. | System error (User Settings Failure, Calibration Data Lost, ATC/ATD Failure, External Disconnection Signal) | Yes | Yes |
Overloaded | Remotely switched off by a GX device or VictronConnect. | Pre-charge timeout (ATD only) or pre-charge error | Yes | Yes | |
Disabled by the user | Remotely switched off by GX device or VictronConnect. | Check that the 'On/Off' settings are configured as desired. | Switched off via VictronConnect | Yes | Yes |
Low temperature | The temperature is too low. This is part of the battery protection mechanism and it is not necessarily indicating a problem. | Cell undertemperature | Yes | Yes | |
High voltage | Voltage level of one or more cells is too high. | Cell overvoltage | Yes | No | |
Low voltage | Voltage level of one or more cells is too low. | Battery bank undervoltage Cell undervoltage | No | Yes | |
High current | [Charge | Discharge] current is too high. | Battery overcurrent | Yes | Yes | |
Low SoC | SoC below discharge floor | No | Yes |