Is your Fronius inverter displaying a Fault Code?

We have been Fronius Service Partners since 2011 and can provide assistance with any and all Fronius Fault Codes.

To further assist you, we will need the following:

Fronius fault codes displayed
Inverter model and no.
Serial no.
Purchase date – establishes warranty expiry date

Next step – One of our service specialists will consult with Fronius and if necessary initiate the exchange of components for Fronius products or a whole device.

The site visit from our trained Solar Electrician can have your solar system up and running in usually one visit, as we bring all the parts to your door. This is one reason we love dealing with Fronius products, they make it so easy to get you back up and generating energy from the sun again!

Please browse the tables below for the specific fault code information your inverter is displaying.

FRONIUS FAULT CODES 1XX

Code	Description	Possible Causes	Troubleshooting Steps
STATE 101	Grid voltage beyond permitted limits	Mains voltage error Incorrect values in the service menu Internal fault	Check grid voltage, check circuit breakers are ON Change Values in the service menu If the problem persists please contact Omega Solar and Batteries
STATE 104	Mains frequency beyond permitted limits	Mains frequency error Incorrect values in the service menu Internal fault	Check mains frequency, check circuit breakers are ON Change values in the service menu If the problem persists please contact Omega Solar and Batteries
STATE 107	Synchronisation with the public mains supply not possible	Mains not connected Incorrect values in the service menu Internal fault	Check mains power, check circuit breakers are ON Change values in the service menu If the problem persists please contact Omega Solar and Batteries
STATE 108	Islanding detected	Islanding detected Severe disturbances in public mains Internal fault	Automatic correction If the problem persists please contact Omega Solar and Batteries

FRONIUS FAULT CODES 2XX

Code	Description	Possible Causes	Troubleshooting Steps
STATE 201	Grid voltage is higher than the specified limit	Grid voltage error on the public mains Internal fault	Check grid voltage If the problem persists, please contact Omega Solar and Batteries
STATE 202	Grid voltage is lower than the specified limit	Grid voltage error on the public mains Internal fault
STATE 203	Grid frequency is higher than the specified limit	Grid frequency error on the public mains Internal fault	Check grid frequency If the problem persists, please contact Omega Solar and Batteries
STATE 204	Grid frequency is lower than the specified limit	Grid frequency error on the public mains Internal fault
STATE 205	Change of public mains impedance	Serious disturbances on the public mains Internal fault	Reinforce mains cables Connect Fronius IG inverter to another phase If the problem persists please contact Omega Solar and Batteries
STATE 206	Absolute value of the impedance is too high	Mains impedance too high Internal fault
STATE 207	Mains relay does not open in spite of switch-off signal	Internal fault	If problem persists, please contact Omega Solar and Batteries
STATE 208	Mains relay does not close in spite of switch-on signal	Internal fault

FRONIUS FAULT CODES 3XX

Code	Description	Possible Causes	Troubleshooting Steps
STATE 301	Safety circuit detects a current peak on the mains supply	Voltage drop on the public mains Internal fault	Automatic correction If the problem persists please contact Omega Solar and Batteries
STATE 302	Safety circuit detects a current peak on the PV generator side	Voltage drop on the public mains supply Internal fault	Automatic correction If the problem persists please contact Omega Solar and Batteries
STATE 303	Heat sink temperature on the DC-AC board is too high	Ventilation slot congested Very high ambient temperature Distance between inverters too small Internal fault	Free ventilation slot Change location of the inverter Increase distance between inverters If the problem persists please contact Omega Solar and Batteries
STATE 304	Heat sink temperature on the DC-DC board is too high
STATE 305	Feed-in process not possible, even though public mains parameter within the limits	Internal Fault	If the problem persists please contact Omega Solar and Batteries
STATE 306	POWER LOW	Intermediate circuit voltage has dropped below permissible threshold value for feed-in	Check panels Internal fault If the problem persists, please contact Omega Solar and Batteries
STATE 307	DC LOW	DC-input voltage is too low for feed in Internal fault
STATE 308	Intermediate circuit voltage out of the maximum limit	Public mains disturbances Internal fault	Reinforce mains cable If the problem persists, please contact Omega Solar and Batteries

FRONIUS FAULT CODES 4XX

Code	Description	Possible causes	Troubleshooting Steps
STATE 401	Communication error between IG control and the DC-DC board	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 402	Write access to the internal Fronius IG memory failed
STATE 403	The area in the internal memory for the country setting is incomplete
STATE 404	Connection between the control unit and the ENS is faulty	Public mains not connected Internal fault	Check the public mains If problem persists please contact Omega Solar and Batteries
STATE 405	An old or incorrect version of the ENS microprocessors has been recognised	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 406	Temperature sensor on the DC-AC board faulty or not connected
STATE 407	Temperature sensor on the DC-DC board faulty or not connected
STATE 408	Unsymmetry on the public mains detected	Public mains disturbances Internal fault	Error is remedied automatically If problem persists please contact Omega Solar and Batteries
STATE 409	Supply of the DC-AC board not available	Internal fault	If your problem persists please contact Omega Solar and Batteries
STATE 410	Service plug on the DC-AC board is not set correctly
STATE 412	Value for fixed voltage is set higher than the open circuit voltage of the PV generator
STATE 413	Open circuit voltage too high in the moment of transformer switching
STATE 414	Memory array for Fronius IG type in EE-PROM faulty	One-off-memory error Internal fault	Error is remedied automatically If problem persists please contact Omega Solar and Batteries
STATE 415	No END-enabling signal despite release by IG-control	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 416	Communication error between IG-Control and power stack	One-off-communication error Internal fault	Error is remedied automatically If problem persists please contact Omega Solar and Batteries
STATE 417	Hardware ID-collision	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 419	Two or more power stacks with identical Unique ID
STATE 420	Incomplete number of power stacks detected after reaching online threshold according to device type
STATE 421	Hardware ID sequence error
STATE 425	Receive time-out for data exchange with one or more power stacks exceeded	One-off error Internal fault	Automatic correction If problem persists please contact Omega Solar and Batteries
STATE 431	All power stacks are in boot mode	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 432	Consistent error in power stack management	One-off error Internal fault	Automatic correction If problem persists please contact Omega Solar and Batteries
STATE 433	Allocation error of dynamic addresses
STATE 434	Ground fault detected
STATE 435	Wrong configuration for EE-Prom
STATE 436	Error transmission faulty
STATE 437	Power stack work around is active
STATE 438	Error during state code transmission	One-off error Permanent error	Automatic correction If problem persists please contact Omega Solar and Batteries
STATE 441	Power rack fan faulty	Internal fault	If problem persists please contact Omega Solar and Batteries
STATE 442	Master for one phase could not be assigned	Temporary communication error Internal fault	Error is remedied automatically If problem persists please contact Omega Solar and Batteries
STATE 443	DC-DC energy transfer failure	Error during switching on a power stack Internal fault	Error is remedied automatically If problem persists please contact Omega Solar and Batteries
STATE 444	AC monitoring self-test interrupted	During the self-test another error occured	Quit the self-test by pressing ESC and remedy the failure according to the error code list

FRONIUS FAULT CODES 5XX

Code	Description	Possible causes	Troubleshooting Steps
STATE 501	Heat sink temperature too high, although Fronius IG is on low output	Ventilation slot congested Internal fault	Free ventilation slot If the problem persists please contact Omega Solar and Batteries
STATE 502	An isolation fault between DC+ or DC- to earth has been detected	Isolation fault at the solar generator	Check cables and solar generator
STATE 504	An error occured while scanning LocalNet addresses	Identical Fronius IG address used twice	Check address of the inverters and other components
STATE 505	The area in the internal memory for the “Setup” values is incomplete	One-off error Internal fault	Automatic correction If the problem persists please contact Omega Solar and Batteries
STATE 506	The area in the internal memory for the “Total” values is incomplete
STATE 507	The area in the internal memory for the “Day/Year” values is incomplete
STATE 508	The area in the internal memory for the “WR number” is damaged
STATE 509	No feed in operation for 24 hours	Snow covered or very dirty solar panels Insufficient power from the solar panels for feed-in operation Internal error	Clean solar panels or remove snow If the problem persists please contact Omega Solar and Batteries
STATE 510	Errors detected by LocalNet self diagnostic system	One-off memory error Internal fault	Automatic correction If the problem persists please contact Omega Solar and Batteries
STATE 511	Errors detected by LocalNet Sensor Card self diagnostic system	One-off memory error Internal fault
STATE 512	According to the device type, too many power stacks have been detected	One-off error Internal fault
STATE 513	Power stacks in boot mode
STATE 514	Incomplete number of power stacks detected after reaching online threshold – Device type
STATE 515	One or more power stacks notified STATE 406/ 407/ 409/ 410	Internal fault	If the problem persists please contact Omega Solar and Batteries
STATE 516	One power stack exceeds the permitted limit of error messages per day (>50x)
STATE 517	Permanent POWER LOW or DC LOW error

If you are having any issues troubleshooting your Fronius fault codes, please do not hesitate to contact Omega Solar and Batteries on 1300 663 422. We will be able to help with any difficult troubleshooting steps and talk you through them to try and help you prevent a technician callout.