Fronius Inverter Fault Codes

When a Fronius inverter has a fault it usually comes up with a state code to explain what's wrong; the following table lists the Fronius IG series inverter STATE codes so you can get an idea on what your Fronius IG inverter error code is.

Fronius STATE codes beginning with 1xx

Fronius STATE codes beginning with 1 are messages from the grid monitoring device (ENS) integrated within the inverter and refer to the parameters of the public mains. Some error checks cross over with the STATE codes beginning with 1, however those in service class 2 are of a higher importance and are displayed for that reason.

Error Code

Message

STATE 101

Grid voltage beyond permitted limits

STATE 107

Synchronisation with the public mains supply not possible

STATE 108

Islanding detected

Fronius STATE codes beginning with 2xx

Fronius STATE codes beginning with 2 are messages from the grid monitoring device (ENS) integrated within the inverter and refer to the parameters of the public mains. Some error checks cross over with the STATE codes beginning with 1, however those in service class 2 are of a higher importance and are displayed for that reason.

Error Code

Message

STATE 201

Grid voltage beyond permitted limits

STATE 202

Grid voltage is lower than the specified limit

STATE 203

Grid frequency is higher than the specified limit

STATE 204

Grid frequency is lower than the specified limit

STATE 205

Change of public mains impedance

STATE 206

Absolute value of the impedance is too high

STATE 207

Mains relay does not open in spite of switch off signal

STATE 208

Mains relay does not close in spite of switch on signal

Fronius STATE codes beginning with 3xx

Fronius STATE codes beginning with 3 are error states that can occur during grid feed in operation, however they do not indicate damaged electronics and do not lead to a remaining interruption of the feed in operation. After switching off and passing the grid monitoring period, the Fronius IG inverter will start feed in operation again. In case of a temperature excess additional cooling down phase is maintained.

Error Code

Message

STATE 301

Safety circuit detects a current peak on the PV generator side

STATE 303

Heat sink temperature on the DC-AC board is too high

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

STATE 306

POWER LOW

STATE 307

DC LOW

STATE 308

Intermediate circuit voltage out of the maximum limit

Fronius STATE codes beginning with 4xx

Fronius STATE codes beginning with 4 are error states that require the intervention of a Fronius Service Partner. They are either temporary or lasting and are triggered by faulty hardware or a software problem. Try switching off the Fronius inverter following the system shutdown procedure, leave off for a few minutes then attempt to restart. If the fault continues please contact your local Fronius Service Partner for further assistance.

Error Code

Message

STATE 401

Communication error between IG control and the DC-DC board

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

STATE 405

An old or incorrect version of the ENS microprocessors has been recognised

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

STATE 409

Supply of the DC-AC board not available

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

STATE 415

No END-enabling signal despite release by IG-control

STATE 416

Communication error between IG-Control and power stack

STATE 417

Hardware ID-collision

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

STATE 431

All power stacks are in boot mode

STATE 432

Consistent error in power stack management

STATE 433

Allocation error of dynamic addresses

STATE 434

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

STATE 441

Power rack fan faulty

STATE 442

Master for one phase could not be assigned

STATE 443

DC-DC energy transfer failure.

STATE 444

AC monitoring self test interrupted

Fronius STATE codes beginning with 5xx

Fronius STATE codes beginning with 5 generally do not stop the feed in operation of the Fronius IG inverter. The STATE codes will be displayed until the message is acknowledged by pushing a button on the display (the inverter will work in feed in operation during this time).

Error Code

Message

STATE 501

Heat sink temperature too high, although Fronius IG is on low output

STATE 504

An isolation fault between DC+ or DC- to earth has been detected

STATE 505

The area in the internal memory for the “Setup” values is incomplete

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

STATE 510

Errors detected by LocalNet self diagnostic system

STATE 511

Errors detected by LocalNet Sensor Card self diagnostic system

STATE 512

According to the device type too many power stacks have been detected

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

STATE 516

One power stack exceeds the permitted limit of error messages per day (>50x)

STATE 517

Permanent POWER LOW or DC LOW error

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