Victron MPPT Solar Charger Error Codes: Troubleshooting Guide
Updated 6 September 2026 · By SolarNevs Research Desk, Dealer surveys + verified sources · 1 source · Method ↗
Key Takeaways
- Most error codes indicate specific hardware, connection, or environmental issues.
- Many errors, particularly those related to temperature, auto-reset once conditions normalize.
- Always check all cable connections and sensor integrity first for sensor-related errors.
- For persistent internal errors or issues not resolved by basic troubleshooting, contact a Victron dealer.
What do Victron MPPT solar charger error codes mean?
Victron MPPT solar chargers display error codes to indicate specific operational issues, ranging from environmental conditions to hardware faults. The most common causes relate to battery temperature, voltage, or sensor connections, and the first step is often to check these external factors. These codes help you diagnose and resolve problems with your Victron MPPT Solar Battery Chargers, Skylla Battery Chargers, Inverter RS / Multi RS, and Orion Smart DC-DC Chargers.
Diagnosis
When your Victron charger displays an error code, follow these steps to diagnose the issue:
- Note the error code. Observe the exact error number displayed on your Victron MPPT charger or visible through the VictronConnect app. This code is your primary indicator of the problem.
- Consult the error code table. Refer to the table below for the specific meaning and initial fix direction for the error code you observed.
- Inspect physical connections. For errors related to temperature or voltage sensors (e.g., Err 3, 4, 5, 6, 7, 8) or battery ripple (Err 11), ensure all cables are securely connected and correctly polarized. Check for any loose terminals, corrosion, or damaged wiring.
- Evaluate environmental conditions. Errors such as "Battery temperature too high" (Err 1), "Battery low temperature" (Err 14), or "Controller overheated" (Err 17) point to environmental factors. Check the ambient temperature around the charger, ensure there is adequate ventilation, and clear any obstructions from heatsinks or cooling vents.
- Verify battery compatibility and settings. If you encounter "Battery voltage too high" (Err 2) or "Battery low temperature" (Err 14), confirm that your battery type and voltage settings configured in the charger match the specifications of the connected battery. For LiFePO4 batteries, charging is intentionally prevented at low temperatures to avoid damage.
- Perform a power cycle. For some errors, including "Controller over-current" (Err 18) or internal sensor failures (Err 21, 22, 23), disconnecting all power sources (PV, battery, and AC if applicable), waiting for at least 3 minutes, and then reconnecting them in the correct sequence can reset the unit.
Cause/fix table section
Symptom detail | Likely cause | Fix |
|---|---|---|
Err 1: Battery temperature too high | Battery temperature exceeds safe limits. | The charger will stop charging to prevent damaging the battery. This error will auto-reset after the battery temperature has dropped. |
Err 2: Battery voltage too high | Battery voltage exceeds safe limits. | This error will auto-reset after the battery voltage has dropped. Check for other charging equipment or a fault in the charge controller. Ensure battery voltage setting matches connected battery. |
Err 3, Err 4: Remote temperature sensor failure | Remote temperature sensor not properly connected or faulty. | Check if the T-sense connector is properly connected to a remote temperature sensor. This error will auto-reset after proper connection. |
Err 5: Remote temperature sensor failure (connection lost) | Connection to remote temperature sensor lost. | Check if the T-sense connector is properly connected to a remote temperature sensor. This error will not auto-reset. |
Err 6, Err 7: Remote battery voltage sense failure | Remote battery voltage sense not properly connected or faulty. | Check if the V-sense connector is properly connected to the battery terminals. Ensure correct polarity. |
Err 8: Remote battery voltage sense failure (connection lost) | Connection to remote battery voltage sense lost. | Check if the V-sense connector is properly connected to the battery terminals. |
Err 11: Battery high ripple voltage | Loose DC cable connections or too thin DC wiring. | To restart the inverter, switch it Off and then On. Continuous high DC ripple reduces inverter life expectancy. |
Err 14: Battery low temperature | Battery temperature is too low for safe charging. | The charger is stopped to avoid charging LiFePO4 batteries at low temperature as this damages the cells. |
Err 17: Controller overheated despite reduced output current | Charger's internal temperature is too high. | This error will auto-reset after charger has cooled down. Check ambient temperature and for obstructions near the heatsink. |
Err 18: Controller over-current | Charger is drawing too much current. | This error will auto-reset. If not, disconnect from all power sources, wait 3 minutes, and power up again. Consider providing adequate cooling, reducing inverter load, or charging the battery before using the inverter. |
Err 20: Maximum Bulk-time exceeded (Solar Chargers) | Battery absorption voltage not reached within 10 hours. | Update to the latest firmware. If the error persists, perform a factory reset and reconfigure the solar charger. |
Err 20: Maximum Bulk-time exceeded (AC Chargers) | Battery absorption voltage not reached within 10 hours, indicating a shorted cell. | This safety protection detects a shorted cell and stops charging. |
Err 21: Current sensor issue | Fault with the internal current sensor. | Disconnect and reconnect all wires to restart the charger. Ensure the minus on the MPPT charge controller is not bypassing the charge controller. This error will not auto-reset. Contact dealer if error remains. |
Err 22, Err 23: Internal temperature sensor failure | Fault with the internal temperature sensor. | Disconnect and reconnect all wires to restart the unit. This error will not auto-reset. Contact dealer if error remains. |
Err 24: Fan failure | Cooling fan is not operating correctly. | This error indicates that the fan is powered on but the circuit does not measure any current draw by the fan. |
Err 26: Terminal overheated | One or more terminals are experiencing excessive heat. | Inspect terminal connections for looseness or corrosion. Reduce load if possible. |
Err 27: Charger short circuit | A short circuit has occurred within the charger. | Isolate the charger from all power sources. This requires professional inspection. |
Err 28: Power stage issue | Problem with the charger's power conversion stage. | This indicates an internal hardware fault. |
Err 29: Over-Charge protection | Battery has reached an over-charge condition. | Check battery settings and ensure they match the battery type. |
Err 33: PV over-voltage | Input voltage from PV array exceeds safe limits. | Verify PV array configuration and open-circuit voltage (Voc). |
Err 34: PV over-current | Input current from PV array exceeds safe limits. | Verify PV array configuration and short-circuit current (Isc). |
Err 35: PV over-power | Input power from PV array exceeds charger's rating. | Verify PV array size is within charger specifications. |
Err 38, Err 39 and Err 80 to Err 87: PV Input shutdown | PV input has been shut down by the system. | Review system logs for the cause of the shutdown. |
Err 40: PV Input failed to shutdown | The PV input could not be properly shut down. | This indicates a control issue within the unit. |
Err 41: Inverter shutdown (PV isolation) | Inverter shut down due to PV isolation fault. | Check PV array for ground faults. |
Err 42: Inverter shutdown (PV isolation) | Inverter shut down due to PV isolation fault. | Check PV array for ground faults. |
Err 43: Inverter shutdown (Ground Fault) | Inverter shut down due to a ground fault. | Check AC and DC wiring for ground faults. |
Err 50, Err 52: Inverter overload, Inverter peak current | Inverter is operating beyond its rated capacity. | Reduce the load connected to the inverter. |
Err 51: Inverter temperature too high | Inverter's internal temperature is too high. | Ensure adequate ventilation and clear obstructions from cooling vents. |
Err 53: Inverter output voltage | Inverter output voltage is outside acceptable range. | Check AC load and grid connection. |
Err 54: Inverter output voltage | Inverter output voltage is outside acceptable range. | Check AC load and grid connection. |
Err 55, Err 56, Err 58: Inverter self test failed | Inverter failed an internal self-test. | This indicates an internal hardware fault. |
Err 57: Inverter ac voltage on output | Unexpected AC voltage detected on inverter output. | Disconnect AC loads and check for external AC sources. |
Err 59: ACIN1 relay test fault | Fault with the AC input 1 relay. | This indicates an internal hardware fault. |
Information 65: Communication warning | Communication issue between devices. | Check communication cables and settings. |
Information 66: Incompatible device | An incompatible device is connected to the system. | Ensure all connected devices are Victron compatible. |
Err 67: BMS Connection lost | Connection to the Battery Management System (BMS) lost. | Check BMS communication cable and connection. |
Err 68: Network misconfigured | System network is incorrectly configured. | Review network settings and configuration. |
Err 69: Network misconfigured | System network is incorrectly configured. | Review network settings and configuration. |
Err 70: Network misconfigured | System network is incorrectly configured. | Review network settings and configuration. |
Err 71: Network misconfigured | System network is incorrectly configured. | Review network settings and configuration. |
Err 72: Phase rotation | Incorrect phase rotation detected. | Verify AC wiring and phase sequence. |
Err 73: Multiple AC inputs | More than one AC input detected when not configured for it. | Check AC wiring and system configuration. |
Err 74: Too many units in parallel | Exceeded the maximum number of parallel units. | Review system design and parallel configuration. |
Err 75: Network misconfigured | System network is incorrectly configured. | Review network settings and configuration. |
Err 76: Network incomplete | Not all expected network devices are detected. | Check network connections and device status. |
Err 77: Settings sync disabled | Settings synchronization is disabled. | Enable settings synchronization if desired. |
Err 114: CPU temperature too high | Internal CPU temperature exceeds safe limits. | Ensure adequate ventilation and clear obstructions. |
Err 116: Calibration data lost | Internal calibration data is missing or corrupted. | This indicates an internal hardware fault. |
Err 117: Incompatible firmware | Incompatible firmware version detected. | Update firmware to a compatible version. |
Err 119: Settings data lost | Internal settings data is missing or corrupted. | Reconfigure settings or perform a factory reset. |
Err 121: Tester fail | Internal test failed. | This indicates an internal hardware fault. |
Err 200: Internal DC voltage error | Internal DC voltage is out of specification. | This indicates an internal hardware fault. |
Err 201: Internal DC voltage error | Internal DC voltage is out of specification. | This indicates an internal hardware fault. |
Err 202: Internal GFCI sensor error | Internal Ground Fault Circuit Interrupter sensor error. | This indicates an internal hardware fault. |
Err 203, Err 205, Err 212, Err 215: Internal supply voltage error | Internal power supply voltage is out of specification. | This indicates an internal hardware fault. |
Safety:
When troubleshooting any electrical system, always prioritize safety. Before inspecting or working on terminals, ensure all power sources—PV array, battery, and AC input/output—are disconnected. Use insulated tools to prevent accidental short circuits. A spanner bridging battery terminals can cause a severe short, leading to burns or equipment damage. For any internal component inspection or replacement, be aware that opening the unit is typically authorized-service work and may void your warranty.
When to call a technician instead
While many Victron MPPT error codes can be resolved with basic troubleshooting, some issues require professional attention. If an error code persists after you have followed the recommended fix directions, or if the error indicates an internal hardware fault (such as Err 28, Err 55, Err 56, Err 58, Err 116, Err 121, Err 200, Err 201, Err 202, Err 203, Err 205, Err 212, Err 215), it is best to contact a qualified Victron Energy dealer or service technician. Attempting to repair internal faults yourself can void your warranty and may pose a safety risk.
Frequently asked questions
What does Err 1 mean on a Victron MPPT charger?
Err 1 indicates the battery temperature is too high. The charger stops charging to prevent battery damage and will auto-reset once the battery temperature drops to a safe level.
How do I fix a remote temperature sensor failure (Err 3, Err 4, Err 5)?
Check if the T-sense connector is properly connected to the remote temperature sensor. For Err 5, the connection was lost and the error will not auto-reset, requiring you to re-establish the connection.
What causes Err 11 (Battery high ripple voltage) on a Victron charger?
Err 11 is usually caused by loose DC cable connections or DC wiring that is too thin. Tighten all DC connections and ensure your wiring gauge is appropriate for the current draw to prevent this.
Why does my Victron MPPT show Err 14 (Battery low temperature)?
Err 14 means the battery temperature is too low. The charger stops to avoid charging LiFePO4 batteries at low temperatures, as this can cause irreversible damage to the cells.
What should I do if I see Err 20 (Maximum Bulk-time exceeded)?
For Victron solar chargers, update the device to the latest firmware. If the error persists, perform a factory reset and then reconfigure the solar charger settings.
References
- Victron Energy MPPT Error Codes — accessed 23 August 2026
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