Fronius Symo 3.0–20.0 (three-phase grid inverter, SnapINverter)

Fronius · PV inverters · 114 codes · 73 with plain-language explanation

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Guides

How to switch a Fronius Symo inverter off and on safely
The manual describes the order for disconnecting AC and DC and the waiting time before any work. Inside the inverter is for qualified staff only.
What the Fronius Symo LEDs mean (red, orange, green)
The manual explains the green, orange and red LED states and points to the status code on the display.

Error codes

Filter codes

STATE 102 AC voltage too high with plain-language explanation
STATE 103 AC voltage too low with plain-language explanation
STATE 105 AC frequency too high with plain-language explanation
STATE 106 AC frequency too low with plain-language explanation
STATE 107 No AC grid with plain-language explanation
STATE 108 Stand-alone operation detected with plain-language explanation
STATE 112 RCMU error with plain-language explanation
STATE 301 Overcurrent (AC) with plain-language explanation
STATE 302 Overcurrent (DC) with plain-language explanation
STATE 303 DC module overtemperature with plain-language explanation
STATE 304 AC module overtemperature with plain-language explanation
STATE 305 No power being fed in, despite closed relay with plain-language explanation
STATE 306 PV output too low for feeding energy into the grid with plain-language explanation
STATE 307 DC low – DC input voltage too low for feeding energy into the grid with plain-language explanation
STATE 308 Intermediate circuit voltage too high with plain-language explanation
STATE 309 DC input voltage MPPT 1 too high with plain-language explanation
STATE 311 Polarity of DC strings reversed with plain-language explanation
STATE 313 DC input voltage MPPT2 too high with plain-language explanation
STATE 314 Current sensor calibration timeout with plain-language explanation
STATE 315 AC current sensor error with plain-language explanation
STATE 316 InterruptCheck fail with plain-language explanation
STATE 325 Overtemperature in the connection area with plain-language explanation
STATE 326 Fan 1 error with plain-language explanation
STATE 327 Fan 2 error with plain-language explanation
STATE 401 Unable to communicate with the power stage set with plain-language explanation
STATE 406 AC module temperature sensor faulty (L1) source text only
STATE 407 AC module temperature sensor faulty (L2) source text only
STATE 408 DC component measured in the grid too high with plain-language explanation
STATE 412 Fixed voltage mode selected instead of MPP voltage mode, fixed voltage set too low or too high with plain-language explanation
STATE 415 Safety cut-out via option card or RECERBO has triggered with plain-language explanation
STATE 416 No communication possible between power stage set and control system source text only
STATE 417 Hardware ID problem source text only
STATE 419 Unique ID conflict source text only
STATE 420 No communication possible with the Fronius Datamanager source text only
STATE 421 HID range error source text only
STATE 425 Unable to communicate with the power stage set with plain-language explanation
STATE 431 Software problem with plain-language explanation
STATE 436 Functional incompatibility (PC boards not compatible, e.g. after replacement) source text only
STATE 437 Power stage set problem source text only
STATE 438 Functional incompatibility (PC boards not compatible, e.g. after replacement) source text only
STATE 443 Intermediate circuit voltage too low or asymmetric with plain-language explanation
STATE 445 Compatibility error / invalid power stage set configuration with plain-language explanation
STATE 447 Insulation fault with plain-language explanation
STATE 448 Neutral conductor not connected with plain-language explanation
STATE 450 Guard cannot be found source text only
STATE 451 Memory error detected source text only
STATE 452 Communication error between the processors with plain-language explanation
STATE 453 Grid voltage and power stage set are incompatible with plain-language explanation
STATE 454 Grid frequency and power stage set are incompatible source text only
STATE 456 Anti-islanding function is no longer being implemented correctly source text only
STATE 457 Grid relay is sticking or the neutral conductor ground voltage is too high with plain-language explanation
STATE 458 Error when recording measuring signal source text only
STATE 459 Error when recording the measuring signal for the insulation test source text only
STATE 460 Reference voltage source for the DSP is working out of tolerance source text only
STATE 461 DSP data memory error with plain-language explanation
STATE 462 Error during DC feed monitoring routine source text only
STATE 463 Reversed AC polarity, AC connector inserted incorrectly with plain-language explanation
STATE 474 RCMU sensor faulty with plain-language explanation
STATE 475 Insulation fault (connection between solar module and ground) with plain-language explanation
STATE 476 Driver supply voltage too low with plain-language explanation
STATE 479 Intermediate circuit voltage relay is switched off with plain-language explanation
STATE 482 Setup interrupted after initial start-up with plain-language explanation
STATE 483 Voltage UDC fixed on MPP2 string out of limits source text only
STATE 485 CAN transmit buffer is full source text only
STATE 489 Permanent overvoltage on intermediate circuit capacitor (five 479 status codes in a row) with plain-language explanation
STATE 502 Insulation error on the solar modules with plain-language explanation
STATE 509 No energy fed into the grid in the past 24 hours with plain-language explanation
STATE 515 Unable to communicate with filter source text only
STATE 516 No communication possible with the storage unit with plain-language explanation
STATE 517 Power derating caused by too high a temperature with plain-language explanation
STATE 518 Internal DSP malfunction source text only
STATE 519 No communication possible with the storage unit source text only
STATE 520 No energy fed into the grid by MPPT1 in the past 24 hours with plain-language explanation
STATE 522 DC low String 1 with plain-language explanation
STATE 523 DC low String 2 with plain-language explanation
STATE 560 Power derating caused by overfrequency with plain-language explanation
STATE 564 Functional incompatibility (PC boards not compatible, e.g. after replacement) source text only
STATE 566 Arc detector switched off (e.g. during external arc monitoring) with plain-language explanation
STATE 568 Incorrect input signal on the multifunction current interface with plain-language explanation
STATE 572 Power limited by the power stage set source text only
STATE 573 Undertemperature warning with plain-language explanation
STATE 581 "Special Purpose Utility-Interactive" (SPUI) setup activated with plain-language explanation
STATE 601 CAN bus is full source text only
STATE 603 AC module temperature sensor faulty (L3) source text only
STATE 604 DC module temperature sensor faulty source text only
STATE 607 RCMU error with plain-language explanation
STATE 608 Functional incompatibility (PC boards not compatible, e.g. after replacement) source text only
STATE 705 Conflict when setting the inverter number (e.g. number already assigned) with plain-language explanation
STATE 721 EEPROM has been re-initialised with plain-language explanation
STATE 731 Initialisation error - USB flash drive is not supported source text only
STATE 732 Initialisation error - Overcurrent on USB flash drive source text only
STATE 733 No USB flash drive connected with plain-language explanation
STATE 734 Update file not recognised or not present with plain-language explanation
STATE 735 Update file does not match the device, update file too old source text only
STATE 736 Write or read error occurred with plain-language explanation
STATE 737 File could not be opened with plain-language explanation
STATE 738 Log file cannot be saved (e.g. USB flash drive is write-protected or full) with plain-language explanation
STATE 740 Initialisation error - error in file system on USB flash drive with plain-language explanation
STATE 741 Error during recording of logging data source text only
STATE 743 Error occurred during update process with plain-language explanation
STATE 745 Update file corrupt with plain-language explanation
STATE 746 Error occurred during update process with plain-language explanation
STATE 751 Time lost with plain-language explanation
STATE 752 Real Time Clock module communication error source text only
STATE 753 Internal error: Real Time Clock module is in emergency mode with plain-language explanation
STATE 757 Hardware error in the Real Time Clock module source text only
STATE 758 Internal error: Real Time Clock module is in emergency mode source text only
STATE 760 Internal hardware error source text only
STATE 766 Emergency power limitation has been activated (max. 750 W) with plain-language explanation
STATE 768 Different power limitation in the hardware modules source text only
STATE 772 Storage unit not available source text only
STATE 773 Software update group 0 (invalid country setup) source text only
STATE 775 PMC power stage set not available with plain-language explanation
STATE 776 Invalid device type source text only

Fronius Symo 3.0–20.0 (three-phase grid inverter, SnapINverter)

Guides

Error codes

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