Is Your Fronius Inverter Displaying a Fault Code?

We are proud to have been Fronius Service Partners since 2011.

If your Fronius Inverter is displaying a fault code, our service specialists can provide you with assistance by consulting with Fronius and initiate the exchange of components for Fronius products.

To help us help you, you will need to supply us with the following information:

The Fronius fault code displayed.
The inverter model and number.
The serial number.
The purchase date to establish the warranty expiry date.

Please browse the table below for the specific fault code information your inverter may be displaying.

FRONIUS FAULT CODES 1XX

Code	Description	Possible Causes
STATE 102	Grid voltage beyond permitted limits	Mains voltage error Incorrect values in the service menu Internal fault
STATE 104	Mains frequency beyond permitted limits	Mains frequency error Incorrect values in the service menu Internal fault
STATE 107	Synchronisation with the public mains supply not possible	Mains not connected Incorrect values in the service menu Internal fault
STATE 108	Islanding detected	Islanding detected Severe disturbances in public mains Internal fault

FRONIUS FAULT CODES 2XX

Code	Description	Possible Causes
STATE 201	Grid voltage is higher than the specified limit	Grid voltage error on the public mains Internal fault
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
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
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
STATE 208	Mains relay does not close in spite of switch-on signal	Internal fault

FRONIUS FAULT CODES 3XX

Code	Description	Possible Causes
STATE 301	Safety circuit detects a current peak on the mains supply	Voltage drop on the public mains Internal fault
STATE 302	Safety circuit detects a current peak on the PV generator side	Voltage drop on the public mains supply Internal fault
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
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
STATE 306	POWER LOW	Intermediate circuit voltage has dropped below permissible threshold value for feed-in
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

FRONIUS FAULT CODES 4XX

Code	Description	Possible causes
STATE 401	Communication error between IG control and the DC-DC board	Internal fault
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	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	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
STATE 409	Supply of the DC-AC board not available	Internal fault
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
STATE 415	No END-enabling signal despite release by IG-control	Internal fault
STATE 416	Communication error between IG-Control and power stack	One-off-communication error Internal fault
STATE 417	Hardware ID-collision	Internal fault
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
STATE 431	All power stacks are in boot mode	Internal fault
STATE 432	Consistent error in power stack management	One-off error Internal fault
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
STATE 441	Power rack fan faulty	Internal fault
STATE 442	Master for one phase could not be assigned	Temporary communication error Internal fault
STATE 443	DC-DC energy transfer failure	Error during switching on a power stack Internal fault
STATE 444	AC monitoring self-test interrupted	During the self-test another error occured

If you are having difficulty with your Fronius Inverter, please contact us.

Our trained Solar Electrician’s can usually have your solar system up and running in one visit as we bring all the parts to your door. This is just one of the reasons we love being a Fronius Service Partner, they make it easy for you to continue generating energy from the sun again!

Fronius Fault Codes 2

Is Your Fronius Inverter Displaying a Fault Code?

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