Fronius IG / IG Plus Inverter Faults and Repairs

Fronius began manufacturing inverters in Austria in 1994 and are widely regarded as one of the best manufacturers of quality solar PV inverters in
the world. Common models installed are IG15, IG20, IG30, the IG Plus 35 V-1, the IG-TL 3.0 and the IG-TL 3.6.

Fronius IG and IG Plus Inverter Faults and Warnings:

State 101 – Grid Voltage beyond speciﬁed limits: The inverter has identiﬁed a grid voltage that is either too low or too high in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 102 – AC Voltage Too High: The inverter has identiﬁed a grid (mains) voltage that is too high in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 103 – AC Voltage Too Low: The inverter has identiﬁed a grid (mains) voltage that is too low in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 104 – Grid frequency Beyond Permitted limits: The inverter has identiﬁed a grid frequency that is either too low or too high in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved. NB: See note about State 104 codes at the bottom of this section.

State 105 – AC Frequency Too High: The inverter has identiﬁed a grid (mains) frequency that is too high in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the frequency is within range. If this fault persists contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 106 – AC Frequency Too Low: The inverter has identiﬁed a grid (mains) frequency that is too low in relation to the parameters that the inverter has been set to safely operate within. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when the frequency is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 107 – No AC Grid Detected: The inverter is not measuring a grid (mains) voltage suggesting that mains power to the unit has been disconnected. A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when mains voltage returns such as might happen when mains power returns after a power cut. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 108 – Islanding Detected: The inverter has identiﬁed that there has been a mains failure (a power cut). A status 1xx fault such as this, will often be temporary, the inverter will monitor the grid and reconnect when mains voltage returns. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 109 – General Mains Error: The inverter has identiﬁed a fault with the AC power supply, this could be due to damaged or faulty AC wiring or it might be picking up a disturbance on the mains supply power network. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 112 – The RCMU has detected a fault current in the Inverter: The inverter has identiﬁed high voltage from the panels. Assuming that this is an existing installation that has been installed correctly, has recently not been changed or upgraded and has operated before without problems. This could mean either a problem with the panels or with the inverter. Contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 201 – AC Voltage Too High: The inverter has identiﬁed a grid (mains) voltage that is too high in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 202 – AC Voltage Too Low: The inverter has identiﬁed a grid (mains) voltage that is too low in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 203 – AC Frequency Too High: The inverter has identiﬁed a grid (mains) frequency that is too high in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the frequency is within range. If this fault persists contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 204 – AC Frequency Too Low: The inverter has identiﬁed a grid (mains) frequency that is too low in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the frequency is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Oﬀ’ then leave them ‘Oﬀ’ and contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 205 – Change of public mains impedance: The inverter has identiﬁed a discrepancy with the grid (mains) in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the situation stabilises. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 206 – Absolute value of mains impedance is too high: The inverter has identiﬁed a discrepancy with the grid (mains) in relation to the parameters that the inverter has been set to safely operate within. A status 2xx fault such as this, will try to correct itself, the inverter will monitor the grid and reconnect when the situation stabilises. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 207 – Mains relay does not open in spite of switch oﬀ signal: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 208 – Mains relay does not close in spite of switch on signal: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 301 – Overcurrent AC: The inverter has identiﬁed an AC current peak on the mains supply. The inverter will monitor the grid and reconnect when the current is within range. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 302 – Overcurrent DC: The inverter has identiﬁed too much current from the panels. Assuming that this is an existing installation that has been installed correctly, has recently not been changed or upgraded and has operated before without problems. This could mean either a problem with the panels or with the inverter. Contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 303 – Over Temperature: The ambient temperature around the inverter is too hot. This could be due to a number of factors, for example

1) If the inverter is exposed to direct sunlight

2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate

3) The inverters components are getting too hot due to an internal component fault. If the unit isn’t running hot and if after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 304 – Over Temperature Cooling Element: The temperature inside the inverter is too hot. This could be due to a number of factors, for example

1) If the inverter is exposed to direct sunlight

2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate

3) The inverters components are getting too hot due to an internal component fault 4) Dust, ﬂuﬀ or a similar obstruction is blocking the vents or fans inside the chassis. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be
resolved.

State 305 – Feed in Process Not Possible: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 306 – Power Low: Intermediate circuit voltage has dropped below permissible threshold value for feed in. This could mean either a problem with the panels or with the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 307 – DC Low: The inverter has identiﬁed low DC voltage. Assuming that this is an existing installation that has been installed correctly, has recently not been changed or upgraded and has operated before without problems. Then we would advise that you contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 308 – Intermediate circuit voltage too high: The inverter has detected a discrepancy with the voltage from the AC power supply, this could be due to damaged or faulty AC wiring or it might be picking up a disturbance on the mains supply power network. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 401 – No internal communication with power stage set: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 402 – Communication with EEPROM not possible: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 403 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 404 – One or both temperature sensors are defective: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 405 – Temperature sensor at cooling element defective: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 406 – Temperature sensor on the PINCI board faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 407 – Temperature sensor on the heat sink faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 408 – Direct current feed in: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 409 – Supply of the DC-AC Board Not Available: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 410 – Service Plug on the DC-AC is not plugged in correctly: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 412 – Value for ﬁxed voltage is set higher than the open circuit voltage of the PV-generator: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 413 – Open circuit voltage too high in the moment of transformer switching: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 414 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 415 – No END-enabling signal: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 416 – Communication with IG Brain not possible: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 417 – Hardware ID Collision: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 419 – Two or more power stacks with identical Unique ID: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 420 – Incomplete number of power stacks detected after reaching online threshold: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 421 – Hardware ID sequence error: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 425 – Communication with the power stage set is not possible: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 431 – All power stage sets are in boot mode: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 432 – Consistent error in power stack management: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 433 – Allocation error of dynamic addresses: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 435 – Wrong conﬁguration in EE-Prom: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 436 – Error transmission faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 437 – Power stack-work-around is active: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 438 – Error during state code transmission: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 441 – Power rack Fan Faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 442 – No phase master for a phase: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 443 – Energy transfer not possible: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 444 – AC monitoring self-test interrupted: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 445 – Invalid power stage set conﬁguration: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 450 – The monitoring of the power stage set main processor ‘Guard’ is active: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 451 – EE Prom of Guard processor defect: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 452 – Communication between Guard and DSP faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 453 – Error in grid voltage recording: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 454 – Error in grid frequency recording: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 455 – Reference power source for AC measurement is operating outside of tolerances: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 456 – Anti islanding test faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 457 – Closed grid relay although start up signal: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 460 – Reference voltage outside permitted limits: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 461 – Rod memory faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 462 – Wrong display version: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 464 – Display error: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 465 – Unknown display version: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 466 – Display is not available: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 467 – Error during start up: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 468 – Memory stack for the menu items faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 469 – Output choke mixed up: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 470 – Relay for higher DC voltage does not open: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 471 – Defect module grounding fuse: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 474 – 100k Ohm module grounding measurement detects failure: This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 475 – DC insulation fault: This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by
themselves, potentially becoming more dangerous over time. We would advise that you contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 501 – 100k Ohm module grounding measurement detects failure: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 502 – An isolation fault between DC+ or DC- to earth has been detected: This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you contact us
with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 504 – No Solar Net communication possible: This is an installation/setup error within the inverter where the same address for the inverter has been used twice.

State 505 – The area in the internal memory for the “Setup” values is incomplete: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 506 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 507 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 508 – The area in the internal memory for the “Total” values is incomplete: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 509 – 24h no feed in: This error is stating that the inverter has not fed in power within the last 24 hours. This could be for a number of reasons including that the panels have been covered in snow, are excessively dirty, the inverter has developed a fault or the panels have not been able to generate power for some other reason. If after the system has been inspected for external inﬂuences and safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 510 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 511 – EEPROM faulty: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 512 – Too many power stage sets in the system: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 513 – Power stage set in boot mode: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 514 – No communication with one of the power stage sets: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 515 – Faulty plug connections: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 516 – One power stack exceeds the permitted limit of error messages per day (>50x): This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 517 – Change of master has taken place: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 517 – Permanent POWER LOW or DC LOW Error: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 550 – Defect string fuse: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 551 – Defect module grounding fuse: This error could be related to an internal inverter error or should a leakage current to ground/earth be detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 553 – Phase master deactivated due to frequently occurring errors: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 554 – EE-Prom of NL_MON defect: This is either an internal error within the inverter or a discrepancy with the mains voltage. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 555 – Axial fan defect: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 556 – Radial fan defect: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 558 – Feature disabled: This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 559 – “Low Voltage Ride Through” event: Grid voltage parameters outside of the limits have caused a grid voltage gap. The inverter attempts to bridge the grid voltage gap. This fault is corrected automatically when the grid parameters return to normal. If this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 560 – Power reduction due to over-frequency: The inverter has reduced output power due to excessive grid frequency. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

State 561 – Power reduction because of excessive temperature: The inverter is measuring a temperature that is too hot and has reduced power output to protect itself. This could be due to a number of factors, for example

1) If the inverter is exposed to direct sunlight

2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate

State 562 – Power reduction because of AC overcurrent: The inverter has identiﬁed excessive AC current and has reduced power output to protect itself. If this fault persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.

NB: State 104: “Grid Frequency is Beyond Permitted limits: This code is a fairly common fault code, in addition to the explanation given by Fronius in relation to grid frequencies below, this fault is often an indication of a faulty or a damaged circuit board within the inverter. Usually but not always, when a circuit board is damaged like this, the Miniature Circuit Breaker (MCB) protecting the AC circuit would also have switched itself ‘Oﬀ’. Depending on the warranty situation and the age, when this State code is present and persists after the mains and the supply circuit has been tested, we usually recommend that the inverter is replaced.

We are familiar and comfortable working with these units, please let us know if there is anything that we can help you with in regards to error codes and faults, repairs, advising on replacements and if you have any performance or safety concerns.

Fronius IG / IG Plus Inverter Faults and Repairs

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