Victron error codes explained

What 23 Victron inverter fault and error codes mean, in plain English, with safe checks you can do and when to call a licensed electrician.

Safety first: never open the switchboard, remove covers, or pull apart or disconnect the inverter, batteries, isolators or wiring. Only use the switches and buttons described here. Anything else must be done by a licensed electrician. Call 1300 209 503 or book a service request.

Guide only. This information is a general guide taken from manufacturer documentation. All electrical work must be performed by a licensed electrician. Never open your inverter, battery or switchboard. If you see smoke, smell burning or see damage, keep clear and call 000.

Code	Message & meaning	Model	Type
VE.Bus Error 1Fault	Device is switched oﬀ because one of the other phases in the system has switched oﬀ Device is switched oﬀ because one of the other phases in the system has switched oﬀ What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 2Fault	New and old type MK2 protocol mixed in the system New and old type MK2 protocol mixed in the system What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 3Fault	Not all, or more than, the expected devices were found in the system Not all, or more than, the expected devices were found in the system What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 4Fault	No other device found No other device found What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 5Warning	Overvoltage on AC out Overvoltage on AC out What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 6Fault	Error in DDC Program Error in DDC Program What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 7Fault	External device connected, assistant required External device connected, assistant required What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 8Safety-Critical	Ground relay test failed Ground relay test failed What you can do Do not touch the panels, rooftop isolators or DC cables Note the code and whether it appears in wet weather or early morning - this helps the electrician If it clears by itself once things dry out, still let us know if it keeps returning Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 10Fault	System time synchronisation problem System time synchronisation problem What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 11Fault	Relay Test Fault - Installation error or possibly relay failure Relay Test Fault - Installation error or possibly relay failure What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 12Warning	Conﬁg mismatch with 2nd mcu Conﬁg mismatch with 2nd mcu What you can do Make sure the system is online so it can receive updates Restart the system once using the owner steps in your manual If the alarm stays, call your installer - settings and firmware must be fixed by them or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 14Fault	Device cannot transmit data Device cannot transmit data What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 15Fault	VE VE.Bus combination error What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 16Warning	VE VE.Bus dongle is missing What you can do Check that your home Wi-Fi/internet is working and restart your router Wait an hour - monitoring often reconnects by itself If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 17Fault	Phase master missing Phase master missing What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 18Warning	AC Over-voltage on the output of a slave while switched oﬀ AC Over-voltage on the output of a slave while switched oﬀ What you can do This is usually caused by the mains supply, not the solar system The inverter normally reconnects by itself once grid voltage is back in range If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 19Fault	Slave does not have AC input! Slave does not have AC input! What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 20Warning	Conﬁguration mismatch Conﬁguration mismatch What you can do Make sure the system is online so it can receive updates Restart the system once using the owner steps in your manual If the alarm stays, call your installer - settings and firmware must be fixed by them or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 22Fault	This device cannot function as a slave This device cannot function as a slave What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 24Fault	Switch-over system protection initiated Switch-over system protection initiated What you can do Note the code, date and time and check the monitoring app Restart the system once using the owner shutdown/start-up steps in your manual if it allows If it comes back, call your installer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 25Fault	Incompatible VE Incompatible VE.Bus conﬁguration What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 26Fault	Internal error Internal error What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter
VE.Bus Error 128Fault	Connect prevented by failing relay test Connect prevented by failing relay test What you can do Note the code, then restart the system once using the owner shutdown/start-up steps in your manual If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer MultiPlus / Quattro (VE.Bus) · Guide only. All work must be done by a licensed electrician.	MultiPlus / Quattro (VE.Bus)	Inverter

Common Victron questions

What does Victron VE.Bus Error 1 "Device is switched oﬀ because one of the other phases in the system has switched oﬀ" mean?

Device is switched oﬀ because one of the other phases in the system has switched oﬀ Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Victron VE.Bus Error 2 "New and old type MK2 protocol mixed in the system" mean?

New and old type MK2 protocol mixed in the system Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does Victron VE.Bus Error 3 "Not all, or more than, the expected devices were found in the system" mean?

Not all, or more than, the expected devices were found in the system Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Victron VE.Bus Error 4 "No other device found" mean?

No other device found Note the code, then restart the system once using the owner shutdown/start-up steps in your manual This is a guide only; any electrical work must be done by a licensed electrician.

What does Victron VE.Bus Error 6 "Error in DDC Program" mean?

Error in DDC Program Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

Need help with this fault?

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Total Solar can help: our licensed electricians install and service systems. Based in Ellenbrook, WA, with Victoria and Queensland also available.

Or call 1300 209 503

Sources

Meanings are summarised from these manufacturer documents. Check your own model's manual, as codes vary between models and firmware versions.

Victron VE.Bus Error Codes (official wiki export)

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Common Victron questions

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