VENUS E Mini troubleshooting and alarm codes
This page reproduces section 4.2 of the MARSTEK Venus E Mini user manual (MST-BIE2-1500). A fault shows as a red Warn/Error LED on the front panel. Check the code in the MARSTEK app.
Users must not open the unit
The manual says the Venus E Mini "should only be repaired by authorized personnel. Users are strictly prohibited from disassembling or repairing any internal components." Unplug it from the socket before any maintenance. In the table below, "turn the inverter off / power off the unit" means switching the Mini off with its On/Off button, nothing more.
General procedure
- Check all electrical connections and the battery status.
- Restart the system using the proper power-cycling procedure.
- Look up known issues in the user manual or FAQ.
- If the problem continues, contact customer support with: full device specifications, a detailed description of the fault, and any error codes or indicator states.
Alarm-code table
"Restart (5 min)" below is short for the manual's: "Turn the inverter off, wait for 5 minutes, and restart. If the problem persists, contact the manufacturer for technical support."
| Code | Alarm | Possible cause | Suggestions |
|---|---|---|---|
| 1 | Bus Overvoltage | 1. Abnormal fluctuation in grid voltage. 2. Internal inverter failure. | 1. Turn the inverter off and check the grid voltage for abnormalities. 2. If no issues are found, wait 5 minutes and restart. 3. If it persists, contact the manufacturer. |
| 2 | Bus Undervoltage | 1. Not enough energy from the battery while running off-grid. 2. Internal inverter failure. | 1. Check the battery level. 2. If energy is low, connect to the grid and check it runs normally. 3. If it persists, contact the manufacturer. |
| 3 | Bus Unbalance | 1. Connected load is very unbalanced. 2. Internal inverter failure. | 1. Remove all loads and check whether the system returns to normal. 2. Restart (5 min). 3. If it persists, contact the manufacturer. |
| 4 | Relay Fault | Internal inverter failure. | Restart (5 min). |
| 5 | Communication Fault | Internal inverter failure. | Restart (5 min). |
| 6 | Storage Fault | Internal inverter failure. | Restart (5 min). |
| 7 | Sampling Error | Internal inverter failure. | Restart (5 min). |
| 8 | Grid Overfrequency | 1. Abnormal local grid frequency. 2. Internal inverter failure. | Restart (5 min). |
| 9 | Grid Underfrequency | 1. Abnormal local grid frequency. 2. Internal inverter failure. | Restart (5 min). |
| 10 | Grid Overvoltage | 1. Abnormal local grid frequency (as printed; probably meant "voltage"). 2. Internal inverter failure. | Restart (5 min). |
| 11 | Grid Undervoltage | 1. Abnormal local grid voltage. 2. Grid is not connected. 3. Internal inverter failure. | 1. Wait for the grid voltage to return to normal. 2. Check that the grid is properly connected. 3. If it does not recover for a long time, contact the manufacturer. |
| 12 | Grid Loss | 1. Local grid failure. 2. Internal inverter failure. | 1. Power off the unit and check whether the local grid voltage is normal. 2. Wait 5 minutes and restart. 3. If it persists, contact the manufacturer. |
| 13 | Inverter Overcurrent | 1. Short circuit at the LOAD terminals. 2. Abnormal local grid. 3. Internal inverter failure. | 1. Power off the unit and check the output terminals for a short circuit. 2. Wait 5 minutes and restart. |
| 14 | Abnormal Frequency | 1. Abnormal local grid frequency. 2. Internal inverter failure. | 1. Wait for the grid frequency to return to normal. 2. Power off, wait 5 minutes and restart. 3. If it doesn't return to normal, contact the manufacturer. |
| 15 | Inverter Overvoltage | 1. Abnormal local grid voltage. 2. Internal inverter failure. | 1. Power off, wait 5 minutes and restart. 2. If it persists, contact the manufacturer. |
| 16 | Inverter Undervoltage | Internal inverter failure. | 1. Power off, wait 5 minutes and restart. 2. If it persists, contact the manufacturer. |
| 17 | Inverter Soft Start Failure | Internal inverter failure. | 1. Power off, wait 5 minutes and restart. 2. If it persists, contact the manufacturer. |
| 18 | Bus Soft Start Failure | Internal inverter failure. | Power off / restart (5 min). |
| 19 | Inverter Overtemperature | 1. Heat sink is blocked. 2. Ambient temperature too high. 3. Internal inverter failure. | 1. Turn the inverter off, check whether the heat sink is blocked, and let it cool down before restarting. 2. If it persists, contact the manufacturer. |
| 20 | DC Resonant Cavity Overcurrent (Comparator) | 1. Abnormal local grid voltage. 2. Internal inverter failure. | Restart (5 min). |
| 21 | DC High-Voltage Bus Overvoltage (Comparator) | Internal inverter failure. | Restart (5 min). |
| 22 | Inverter Short Circuit | 1. Short circuit at the output terminals. 2. Internal inverter failure. | 1. Power off the unit and check the output terminals for a short circuit. 2. Wait 5 minutes and restart. 3. If it persists, contact the manufacturer. |
| 23 | Abnormal Leakage Current | 1. Not enough insulation between PV panels and ground. 2. Internal inverter failure. | 1. Check all wiring for damage and verify insulation to ground. 2. Restart (5 min). 3. If it persists, contact the manufacturer. |
| 24 | Meter Communication Fault | 1. Meter connection is abnormal. 2. Internal inverter failure. | 1. Power off the unit and check the meter connection. 2. If it persists, contact the manufacturer. |
| 25 | Overtemperature Derating | 1. Heat sink is blocked. 2. Ambient temperature too high. 3. Internal inverter failure. | 1. Turn the inverter off, check the heat sink and let it cool before restarting. 2. If it persists, contact the manufacturer. |
| 26 | Balancing Bridge Arm Overcurrent | Internal inverter failure. | Restart (5 min). |
| 27 | Inverter Hardware Overcurrent | 1. Short circuit at the output terminals. 2. Grid terminal struck by lightning. 3. Internal inverter failure. | 1. Power off the unit and check the output terminals for a short circuit. 2. Wait 5 minutes and restart. 3. If it persists, contact the manufacturer. |
| 28 | Off-grid Overload | 1. Load power is above the rated power. 2. Connected load has a high inrush current. | 1. Check whether the total load is too high. 2. If it persists, contact the manufacturer. |
| 29 | Battery Overvoltage | 1. Battery overcharged. 2. Poor cell consistency (one cell voltage too high). 3. Internal battery pack failure. | Power off the unit and contact the manufacturer for technical support. |
| 30 | Battery Undervoltage | 1. Battery self-discharged after long storage. 2. Internal battery pack failure. | 1. Connect the grid to use the battery activation function for charging. 2. If the battery cannot be activated, contact the manufacturer. |
| 31 | Battery Overcurrent | 1. Battery output power above the rated power. 2. Internal battery pack failure. | 1. Turn the inverter off, wait 5 minutes, connect to the grid and restart. 2. If it persists, contact the manufacturer. |
| 32 | Battery Overtemperature | 1. Heat sink is blocked. 2. Ambient temperature too high. 3. Internal battery pack failure. | 1. Turn the inverter off, check the heat sink, and let the battery cool before restarting. 2. If it persists, contact the manufacturer. |
| 33 | Battery Low Temperature | 1. Ambient temperature too low. 2. Internal battery pack failure. | 1. Turn the inverter off and check that the ambient temperature is within the normal operating range. 2. If it persists, contact the manufacturer. |
| 34 | Battery Short | Internal battery pack failure. | Power off the unit and contact the manufacturer for technical support. |
| 35 | Battery Overload | 1. Battery output power above the rated power. 2. Internal battery pack failure. | 1. Turn the inverter off, wait 5 minutes, connect to the grid and restart. 2. If it persists, contact the manufacturer. |
| 36 | Low Battery State of Health (SOH) | Battery cell performance has degraded. | Contact the manufacturer for technical support. |
| 37 | Battery Full Charge Protection | Battery is fully charged. | Stop charging the battery. |
How this table was reconstructed
The Drive text extraction of the Mini manual breaks the table layout. On pages 13–15 the suggestions are separated from their codes. Codes 1–7, 13–17 and 28–37 come through cleanly. For codes 8–12 and 18–27, this page matches each suggestion to its code by content (e.g. the "check the meter connection" suggestion goes to code 24, Meter Communication Fault). Codes 18, 20, 21 and 26 all use the same "power off, wait 5 minutes, restart" advice, so the exact pairing does not change what to do. Check against the PDF before quoting a code as definitive.
Code 23 mentions PV panels
Code 23's cause says "insulation between PV panels and ground". The Mini is an AC-coupled battery with no PV input in its spec table, so this text looks inherited from MARSTEK's hybrid-inverter manuals. If code 23 appears, check the Mini's AC wiring and earthing, and escalate to MARSTEK support.
Related pages
- VENUS E Mini product page
- VENUS E Mini quick start
- VENUS E 3.0 troubleshooting (the VENUS E 3.0 uses a different code scheme, 400–5D2)
Sources
- VENUS E Mini user manual MST-BIE2-1500 (Drive), section 4.2 Troubleshooting