V6000 troubleshooting and alarm codes

When the V6000 has a fault, the fault indicator on the front display lights up and shows a three-digit fault code (manual section 5.2). This page reproduces the Alarm Code Index from the appendix of the V6000 user manual V1.0.

Do not open the enclosure

The manual says: "Deep maintenance, annual servicing, or any operations that involve opening the equipment enclosure or accessing internal high-voltage components must NOT be performed by the user... must only be carried out by our certified professional technicians." The steps below are limited to restarting, removing loads, checking inputs and the environment, and contacting support. Before any wiring check, the unit must be fully de-energised.

Quick guide to the suggested actions

Action in the table	What it means
Restart	Restart the unit and check whether the fault clears. If it persists, contact the manufacturer for technical support.
Remove loads	Remove all loads and restart the unit. Optionally reconnect with a smaller load. Check whether the fault clears. If it persists, contact the manufacturer.
Stop & call	Power off the unit and contact the manufacturer for technical support immediately.
Check PV	Power off the unit and check whether the PV input is normal, then restart. If it persists, contact the manufacturer.
Cool down	Power off the unit and check the ambient temperature. Place it somewhere between 0 °C and 50 °C, let it rest for 10 minutes, then restart. If the fault does not clear, contact the manufacturer.

Inverter / power-stage codes (001–041)

Code	Alarm	Suggestion
001	BUS Overvoltage	Restart
002	BUS Undervoltage	Restart
003	BUS Soft-Start Timeout	Restart
004	Inverter Soft-Start Timeout	Restart
005	Inverter Overcurrent (Software)	Remove loads
006	Inverter Overcurrent (Hardware)	Remove loads
007	Inverter Undervoltage	Restart
008	Inverter Overvoltage	Restart
009	Inverter Output Short Circuit	Remove loads
010	Inverter Circuit Sensor Fault	Restart
011	Unexpected Current Feedback Into Inverter	Stop & call
012	Overload	Remove loads
013	Output Current Sensor Fault	Restart
014	Current Sharing Sensor Fault	Restart
015	Input/Output Reverse Connection	Stop & call
016	Output Relay Fault	Stop & call
017	Battery Overvoltage	Discharge the unit. If the problem persists, contact the manufacturer.
018	Buck-Boost Overcurrent	Restart
019	Buck-Boost Current Sensor Fault	Restart
020	Buck-Boost Filter Current Sensor Fault	Restart
021	DC/DC Soft-Start Failure	Restart
022	Buck-Boost Hardware Overcurrent	Remove loads
023	LLC Overcurrent	Remove loads
024	LLC Transformer Fault	Stop & call
025	PV Overvoltage	Check PV
026	PV Short Circuit	Check PV
027	PV Power Abnormality	Check PV
028	PV Input Overcurrent	Check PV
029	Fan Locked Rotor	Stop & call
030	PV Side Overtemperature / NTC Disconnected	Cool down
031	Inverter Side Overtemperature / NTC Disconnected	Cool down
032	LLC Low-Voltage Side Overtemperature / NTC Disconnected	Cool down
033	LLC High-Voltage Side Overtemperature / NTC Disconnected	Cool down
034	LLC Transformer Overtemperature	Cool down
035	Parallel CAN Communication Fault	Check the parallel wiring connections. If it persists, contact the manufacturer.
036	Parallel Master Signal Loss	Check the parallel wiring connections. If it persists, contact the manufacturer.
037	Parallel Sync Signal Loss	Check the parallel wiring connections. If it persists, contact the manufacturer.
038	Parallel Version Mismatch	Try upgrading the software to the latest version and check whether the fault clears. If it persists, contact the manufacturer.
039	Parallel Output Current Fault	Restart
040	Parallel Output Configuration Error	Check the parallel operation configuration settings.
041	Incorrect Standalone Wiring Used in Parallel Mode	Check that the parallel wiring and configuration settings match.

Battery / BMS codes (101–115)

Code	Alarm	Suggestion
101	Module Overvoltage	Power off and wait 5 minutes. Power on and check whether the fault clears. If it persists, contact the manufacturer.
102	Module Undervoltage	Connect the unit to the grid or PV to charge the battery and check whether it resolves. If not, contact the manufacturer.
103	Cell Overvoltage	Power off and wait 5 minutes, then check whether the fault clears. If it persists, contact the manufacturer.
104	Cell Undervoltage	Connect the unit to the grid or a charger to charge the battery and check whether it resolves. If not, contact the manufacturer.
105	Cell Overtemperature	Power off and wait, then check whether the fault clears. If it persists, contact the manufacturer.
106	Cell Undertemperature	Check the ambient temperature, restart and check whether the fault clears. If it persists, contact the manufacturer.
107	MOSFET Overtemperature	Check the ambient temperature, restart and check whether the fault clears. If it persists, contact the manufacturer.
108	Charge Overcurrent	Disconnect the grid and PV supply, then restart and check whether the fault clears. If it persists, contact the manufacturer.
109	Discharge Overcurrent	Remove loads
110	System Fault Protection	Restart
111	Charge MOSFET Failure	Stop & call
112	Discharge MOSFET Failure	Stop & call
113	Ambient Overtemperature Protection	Check the ambient temperature and keep the device between 0–50 °C. If it does not resolve, contact the manufacturer.
114	Ambient Undertemperature Protection	Check the ambient temperature and keep the device between 0–50 °C. If it does not resolve, contact the manufacturer.
115	Short Circuit Protection	Restart

Communication / upgrade codes (201–205)

Code	Alarm	Suggestion
201	MQTT Session Connection Failed: Socket Connection Failure	Restart
202	MQTT Session Connection Failed: Client Identifier Occupied	Restart
203	MQTT Client-Server Connection Failed	Restart
204	INV: No Response to Prepare Upgrade Command	Restart
205	BMS: No Response to Prepare Upgrade Command	Restart

How this table was reconstructed

The Drive text extraction lists some alarm names apart from their code numbers (011–016, 023–028, 033–037, 103–108 and 201–205). This page pairs them in the order they appear, checked against each suggestion (for example, the "check the ambient temperature" steps go with the temperature alarms). All five 201–205 codes share the same "restart" advice, so their exact order does not change what to do. Check the PDF before quoting a specific code as definitive.

Common situations

These are explanations based on the table, not extra manual instructions.

Situation	Likely codes	First step
Too many appliances on AC-OUT, or a motor or compressor with high start-up current	005, 006, 009, 012, 109	Remove loads, restart, then add loads back gradually. AC output is 6 kW continuous / 12 kW peak.
Unit in a hot room or direct sun	030–034, 105, 107, 113	Move it or ventilate the space to keep it between 0–50 °C, rest 10 minutes, then restart.
Solar problem after rain or new panel work	025–028	Power off and have the installer check the PV strings (80–500 V, 16 A max per input).
Battery flat after a long brownout	102, 104	Reconnect the grid or PV to recharge.
App or cloud not updating	201–205	Restart the unit and check the Wi-Fi.

When to stop using it and call for service

From manual section 7.2, stop using the V6000 immediately and contact Silvera Solar Power or MARSTEK if you see:

• persistent alarm codes on the display;
• unusual noise, smell, or visible overheating, bulging or leakage;
• a sudden, unexplained drop in capacity or output power;
• any cable, terminal or connector that looks burnt or discoloured, or can't be tightened securely.

Emergencies (manual section 1.5)

• Electrolyte leak: don't enter the room, and avoid the liquid and gas. Call emergency services if needed. For eye or skin contact, rinse with plenty of water for at least 15 minutes and get medical help.
• Fire: switch off all connected power sources if safe. For a battery fire, use fire sand, a CO2 extinguisher or other approved electrical-fire equipment. If the fire hasn't reached the battery, a Type ABC extinguisher can be used. Watch for re-ignition.
• Flood: don't touch the unit and switch off all breakers. Wait for the water to recede, then contact MARSTEK or an authorised service partner. Do not reuse a flooded battery.

Related pages

• V6000 product page
• V6000 quick start

Sources

• V6000 user manual V1.0 (Drive): Appendix Alarm Code Index, sections 1.5, 5.2, 7.2