Fronius Fault Codes

Is your Fronius inverter displaying a Fault Code?

FRONIUS PRIMO 5KW e1529553275115 - Fronius Fault Codes
flogo1 - Fronius Fault Codes

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. 

CodeDescriptionPossible CausesTroubleshooting Steps
STATE 101Grid voltage beyond permitted limits
  1. Mains voltage error
  2. Incorrect values in the service menu
  3. Internal fault
  1. Check grid voltage, check circuit breakers are ON
  2. Change Values in the service menu
  3. If the problem persists please contact Omega Solar and Batteries
STATE 104Mains frequency beyond permitted limits
  1. Mains frequency error
  2. Incorrect values in the service menu
  3. Internal fault
  1. Check mains frequency, check circuit breakers are ON
  2. Change values in the service menu
  3. If the problem persists please contact Omega Solar and Batteries
STATE 107Synchronisation with the public mains supply not possible
  1. Mains not connected
  2. Incorrect values in the service menu
  3. Internal fault
  1. Check mains power, check circuit breakers are ON
  2. Change values in the service menu
  3. If the problem persists please contact Omega Solar and Batteries
STATE 108Islanding detected
  1. Islanding detected
  2. Severe disturbances in public mains
  3. Internal fault
  1. Automatic correction
  2. If the problem persists please contact Omega Solar and Batteries
CodeDescriptionPossible CausesTroubleshooting Steps
STATE 201Grid voltage is higher than the specified limit
  1. Grid voltage error on the public mains
  2. Internal fault
  1. Check grid voltage
  2. If the problem persists, please contact Omega Solar and Batteries
STATE 202Grid voltage is lower than the specified limit
STATE 203

Grid frequency is higher than the specified limit

  1. Grid frequency error on the public mains
  2.  Internal fault
  1. Check grid frequency
  2. If the problem persists, please contact Omega Solar and Batteries
STATE 204Grid frequency is lower than the specified limit
STATE 205Change of public mains impedance
  1. Serious disturbances on the public mains
  2. Internal fault
  1. Reinforce mains cables
  2. Connect Fronius IG inverter to another phase
  3. If the problem persists please contact Omega Solar and Batteries
STATE 206Absolute value of the impedance is too high
  1. Mains impedance too high
  2. Internal fault
STATE 207

Mains relay does not open in spite of switch-off signal

  1. Internal fault
  1. If problem persists, please contact Omega Solar and Batteries
STATE 208

Mains relay does not close in spite of switch-on signal

CodeDescriptionPossible CausesTroubleshooting Steps
STATE 301Safety circuit detects a current peak on the mains supply
  1. Voltage drop on the public mains
  2. Internal fault
  1. Automatic correction
  2. If the problem persists please contact Omega Solar and Batteries
STATE 302Safety circuit detects a current peak on the PV generator side
  1. Voltage drop on the public mains supply
  2. Internal fault
  1. Automatic correction
  2. If the problem persists please contact Omega Solar and Batteries
STATE 303Heat sink temperature on the DC-AC board is too high
  1. Ventilation slot congested
  2. Very high ambient temperature
  3. Distance between inverters too small
  4. Internal fault
  1. Free ventilation slot
  2. Change location of the inverter
  3. Increase distance between inverters
  4. If the problem persists please contact Omega Solar and Batteries
STATE 304Heat sink temperature on the DC-DC board is too high
STATE 305Feed-in process not possible, even though public mains parameter within the limits
  1. Internal Fault
  1. If the problem persists please contact Omega Solar and Batteries
STATE 306POWER LOW
  1. Intermediate circuit voltage has dropped below permissible threshold value for feed-in
  1. Check panels
  2. Internal fault
  3. If the problem persists, please contact Omega Solar and Batteries
STATE 307DC LOW
  1. DC-input voltage is too low for feed in
  2. Internal fault
STATE 308Intermediate circuit voltage out of the maximum limit
  1. Public mains disturbances
  2. Internal fault
  1. Reinforce mains cable
  2. If the problem persists, please contact Omega Solar and Batteries
CodeDescriptionPossible causesTroubleshooting Steps
STATE 401Communication error between IG control and the DC-DC board
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 402Write access to the internal Fronius IG memory failed
STATE 403The area in the internal memory for the country setting is incomplete
STATE 404Connection between the control unit and the ENS is faulty
  1. Public mains not connected
  2. Internal fault
  1. Check the public mains
  2. If problem persists please contact Omega Solar and Batteries
STATE 405An old or incorrect version of the ENS microprocessors has been recognised
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 406Temperature sensor on the DC-AC board faulty or not connected
STATE 407Temperature sensor on the DC-DC board faulty or not connected
STATE 408Unsymmetry on the public mains detected
  1. Public mains disturbances
  2. Internal fault
  1. Error is remedied automatically
  2. If problem persists please contact Omega Solar and Batteries
STATE 409Supply of the DC-AC board not available
  1. Internal fault
  1. If your problem persists please contact Omega Solar and Batteries
STATE 410Service plug on the DC-AC board is not set correctly
STATE 412Value for fixed voltage is set higher than the open circuit voltage of the PV generator
STATE 413Open circuit voltage too high in the moment of transformer switching
STATE 414Memory array for Fronius IG type in EE-PROM faulty
  1. One-off-memory error
  2. Internal fault
  1. Error is remedied automatically
  2. If problem persists please contact Omega Solar and Batteries
STATE 415No END-enabling signal despite release by IG-control
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 416Communication error between IG-Control and power stack
  1. One-off-communication error
  2. Internal fault
  1. Error is remedied automatically
  2. If problem persists please contact Omega Solar and Batteries
STATE 417Hardware ID-collision
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 419Two or more power stacks with identical Unique ID
STATE 420Incomplete number of power stacks detected after reaching online threshold according to device type
STATE 421Hardware ID sequence error
STATE 425Receive time-out for data exchange with one or more power stacks exceeded
  1. One-off error
  2. Internal fault
  1. Automatic correction
  2. If problem persists please contact Omega Solar and Batteries
STATE 431All power stacks are in boot mode
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 432Consistent error in power stack management
  1. One-off error
  2. Internal fault
  1. Automatic correction
  2. If problem persists please contact Omega Solar and Batteries
STATE 433Allocation error of dynamic addresses
STATE 434Ground fault detected
STATE 435Wrong configuration for EE-Prom
STATE 436Error transmission faulty
STATE 437Power stack work around is active
STATE 438Error during state code transmission
  1. One-off error
  2. Permanent error
  1. Automatic correction
  2. If problem persists please contact Omega Solar and Batteries
STATE 441Power rack fan faulty
  1. Internal fault
  1. If problem persists please contact Omega Solar and Batteries
STATE 442Master for one phase could not be assigned
  1. Temporary communication error
  2. Internal fault
  1. Error is remedied automatically
  2. If problem persists please contact Omega Solar and Batteries
STATE 443DC-DC energy transfer failure
  1. Error during switching on a power stack
  2. Internal fault
  1. Error is remedied automatically
  2. If problem persists please contact Omega Solar and Batteries
STATE 444AC monitoring self-test interrupted
  1. During the self-test another error occured
  1. Quit the self-test by pressing ESC and remedy the failure according to the error code list
CodeDescriptionPossible causesTroubleshooting Steps
STATE 501Heat sink temperature too high, although Fronius IG is on low output
  1. Ventilation slot congested
  2. Internal fault
  1. Free ventilation slot
  2. If the problem persists please contact Omega Solar and Batteries
STATE 502An isolation fault between DC+ or DC- to earth has been detected
  1. Isolation fault at the solar generator
  1. Check cables and solar generator
STATE 504An error occured while scanning LocalNet addresses
  1. Identical Fronius IG address used twice
  1. Check address of the inverters and other components
STATE 505The area in the internal memory for the “Setup” values is incomplete
  1. One-off error
  2. Internal fault
  1. Automatic correction
  2. If the problem persists please contact Omega Solar and Batteries
STATE 506The area in the internal memory for the “Total” values is incomplete
STATE 507The area in the internal memory for the “Day/Year” values is incomplete
STATE 508The area in the internal memory for the “WR number” is damaged
STATE 509No feed in operation for 24 hours
  1. Snow covered or very dirty solar panels
  2. Insufficient power from the solar panels for feed-in operation
  3. Internal error
  1. Clean solar panels or remove snow
  2. If the problem persists please contact Omega Solar and Batteries
STATE 510Errors detected by LocalNet self diagnostic system
  1. One-off memory error
  2. Internal fault
  1. Automatic correction
  2. If the problem persists please contact Omega Solar and Batteries
STATE 511Errors detected by LocalNet Sensor Card self diagnostic system
STATE 512According to the device type, too many power stacks have been detected
  1. One-off error
  2. Internal fault
STATE 513Power stacks in boot mode
STATE 514Incomplete number of power stacks detected after reaching online threshold – Device type
STATE 515One or more power stacks notified STATE 406/ 407/ 409/ 410
  1. Internal fault
  1. If the problem persists please contact Omega Solar and Batteries
STATE 516One power stack exceeds the permitted limit of error messages per day (>50x)
STATE 517Permanent 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.