Fronius Solar Inverters
60 fault codes documented
Error 1 (Binary 0001) — Hardware fault
The Fronius Solar Inverter has detected an internal hardware problem. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LED 1 specifically illuminated for the binary code.
Error 10 (Binary 1010) — General fieldbus error
The Fronius Solar Inverter has detected a general error within its fieldbus communication system. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 2 and 8 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 102 — AC voltage too high
The inverter has detected that the AC grid voltage is too high, causing it to temporarily disconnect from the grid for safety reasons. The inverter will resume feeding energy once grid conditions return to normal.
Fronius Symo Hybrid Inverter Code 103 — AC voltage too low
The inverter has detected that the AC grid voltage is too low, causing it to temporarily disconnect from the grid. The inverter will resume feeding energy once grid conditions return to normal.
Fronius Symo Hybrid Inverter Code 105 — AC frequency too high
The inverter has detected that the AC grid frequency is too high, causing it to temporarily disconnect from the grid. The inverter will resume feeding energy once grid conditions return to normal.
Fronius Symo Hybrid Inverter Code 106 — AC frequency too low
The inverter has detected that the AC grid frequency is too low, causing it to temporarily disconnect from the grid. The inverter will resume feeding energy once grid conditions return to normal.
Fronius Symo Hybrid Inverter Code 107 — No AC grid detected
The inverter has detected an absence of the AC grid, causing it to temporarily disconnect. The inverter will resume feeding energy once grid conditions return to normal.
Fronius Symo Hybrid Inverter Code 108 — Stand-alone operation detected
The inverter has detected conditions that indicate it is operating in stand-alone mode, separate from the main AC grid. It will temporarily disconnect and resume feeding energy once grid conditions are restored.
Error 11 (Binary 1011) — Parity error or stop bit error (frame check)
The Fronius Solar Inverter has detected a data integrity error during communication, specifically a parity or stop bit error. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1, 2, and 8 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 112 — RCMU error
The Residual Current Monitoring Unit (RCMU) in the inverter has detected an error. This causes the inverter to temporarily disconnect from the grid.
Error 13 (Binary 1101) — Fieldbus configuration error
The Fronius Solar Inverter has detected an incorrect configuration within its fieldbus communication system. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1, 4, and 8 specifically illuminated for the binary code.
Error 14 (Binary 1110) — Fieldbus data buffer overflow
The Fronius Solar Inverter's fieldbus data buffer has overflowed, meaning it received more data than it could process. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 2, 4, and 8 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 143 — Emergency power overload
The emergency power mode has been interrupted due to an overload condition. The inverter will attempt to restart emergency power mode up to three times. If unsuccessful, code 145 will be displayed.
Fronius Symo Hybrid Inverter Code 144 — Emergency power short-circuit
A short-circuit has been detected in the emergency power circuit, interrupting its operation. The inverter will attempt to restart emergency power mode up to three times. If unsuccessful, code 145 will be displayed.
Fronius Symo Hybrid Inverter Code 145 — Emergency power failure (Codes 143 or 144 occurred more than three times)
This status code indicates that either an emergency power overload (143) or a short-circuit (144) has occurred more than three times, preventing stable emergency power operation.
Error 2 (Binary 0010) — EEROM fault
The Fronius Solar Inverter has detected an issue with its internal EEROM (Electrically Erasable Programmable Read-Only Memory). This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LED 2 specifically illuminated for the binary code.
Error 3 (Binary 0011) — Internal memory error
The Fronius Solar Inverter has detected an error within its internal memory system. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1 and 2 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 301 — Overcurrent (AC)
A temporary overcurrent condition has been detected on the AC side, causing a short-term interruption in feeding energy into the grid. The inverter will automatically attempt to restart its operation.
Fronius Symo Hybrid Inverter Code 302 — Overcurrent (DC) or battery not detected
A temporary overcurrent condition has been detected on the DC side, or the battery is not being detected. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.
Fronius Symo Hybrid Inverter Code 303 — DC module overtemperature (PV)
The DC module (PV side) of the inverter has detected an excessively high temperature. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.
Fronius Symo Hybrid Inverter Code 304 — AC module overtemperature
The AC module of the inverter has detected an excessively high temperature. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.
Fronius Symo Hybrid Inverter Code 305 — No power being fed in, despite closed relays
The inverter is not feeding power into the grid even though the internal relays are closed, indicating a discrepancy. This causes a short-term interruption, and the inverter will attempt to restart.
Fronius Symo Hybrid Inverter Code 306 — Not enough PV power or no power requested from battery
There is insufficient PV power available for feeding energy into the grid, and no power has been requested from the battery. This can be a normal occurrence during low light conditions (early morning/evening).
Fronius Symo Hybrid Inverter Code 307 — DC low (DC input voltage too low for feeding into grid)
The DC input voltage from the solar modules is too low to effectively feed energy into the grid. This can be a normal occurrence during low light conditions (early morning/evening).
Fronius Symo Hybrid Inverter Code 308 — Intermediate circuit voltage too high
The voltage in the inverter's intermediate circuit has become excessively high. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.
Fronius Symo Hybrid Inverter Code 309 — PV input voltage too high
The input voltage from the photovoltaic (PV) modules has exceeded the inverter's permissible limit. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.
Error 4 (Binary 0100) — Fieldbus hardware fault
The Fronius Solar Inverter has detected a hardware fault related to its fieldbus communication system. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LED 4 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 458 — Error when recording measuring signal
The inverter has encountered an error while attempting to record a measuring signal. As a result, the inverter is not feeding any energy into the grid.
Fronius Symo Hybrid Inverter Code 459 — Error when recording the measuring signal for the insulation test
The inverter has encountered an error during its insulation test measurement. This error prevents the inverter from feeding energy into the grid.
Fronius Symo Hybrid Inverter Code 460 — Reference voltage source for DSP is out of tolerance
The reference voltage source for the Digital Signal Processor (DSP) within the inverter is operating outside its acceptable tolerance. This critical error prevents the inverter from feeding energy into the grid.
Fronius Symo Hybrid Inverter Code 461 — DSP data memory error
An error has occurred in the data memory associated with the Digital Signal Processor (DSP) within the inverter. This prevents the inverter from feeding energy into the grid.
Fronius Symo Hybrid Inverter Code 462 — Error during DC feed monitoring routine
The inverter has encountered an error during its routine monitoring of the DC feed. This prevents the inverter from feeding any energy into the grid.
Fronius Symo Hybrid Inverter Code 463 — Reversed AC polarity, AC connector inserted incorrectly
The inverter has detected reversed AC polarity, likely due to the AC connector being inserted incorrectly during installation or maintenance. This critical error prevents the inverter from feeding energy into the grid.
Fronius Symo Hybrid Inverter Code 474 — RCMU sensor faulty
The Residual Current Monitoring Unit (RCMU) sensor within the inverter has been detected as faulty. This prevents the inverter from feeding any energy into the grid.
Fronius Symo Hybrid Inverter Code 475 — Insulation fault (solar module or ground)
An insulation fault has been detected, indicating a problematic connection between a solar module and the ground. This safety measure prevents the inverter from feeding any energy into the grid.
Fronius Symo Hybrid Inverter Code 476 — Driver supply voltage too low
The supply voltage to the internal driver circuits within the inverter has fallen below the minimum required level. This critical issue prevents the inverter from feeding any energy into the grid.
Fronius Symo Hybrid Inverter Code 480, 481 — Functional incompatibility (PC boards)
One or more PC boards within the inverter are not compatible with each other, for instance, after a replacement. This prevents the inverter from feeding any energy into the grid.
Error 5 (Binary 0101) — Script error
The Fronius Solar Inverter has encountered an error in its internal scripting or software execution. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1 and 4 specifically illuminated for the binary code.
Fronius Symo Hybrid Inverter Code 509 — No energy fed into the grid in the past 24 hours
A warning message on the display indicates that the inverter has not fed any energy into the grid over the last 24-hour period. This could be due to various reasons affecting power generation or grid connection.
Fronius Symo Hybrid Inverter Code 515 — Unable to communicate with filter
A warning message on the display indicates that the inverter is unable to communicate with its internal or external filter unit. This can impact system performance or safety functions.
Fronius Symo Hybrid Inverter Code 516 — Unable to communicate with the data storage unit
A warning message appears on the display, indicating a problem with communication to the data storage unit. This means the inverter might not be able to record operational data.
Fronius Symo Hybrid Inverter Code 517 — Power derating caused by excessively high temperatures
A warning message is shown on the display indicating that the inverter is reducing its power output due to excessively high internal temperatures. This is a protective measure to prevent damage.
Fronius Symo Hybrid Inverter Code 520 — No energy fed into the grid by the PV in the past 24 hours
A warning message on the display indicates that no energy from the photovoltaic (PV) modules has been fed into the grid during the last 24 hours. This implies an issue with PV generation or feed-in.
Fronius Symo Hybrid Inverter Code 522 — DC low (PV), No PV voltage available
A warning message on the display indicates that the DC voltage from the photovoltaic (PV) modules is too low or unavailable. For hybrid systems, this message can appear normally overnight or in standby mode.
Fronius Symo Hybrid Inverter Code 558, 559 — Functional incompatibility (PC boards)
A warning message on the display indicates that one or more PC boards within the inverter are not compatible with each other, for example, after a replacement. This can affect the inverter's functionality.
Fronius Symo Hybrid Inverter Code 560 — Power derating caused by overfrequency
The inverter is reducing its power output because the grid frequency has become excessively high. This is a protective measure. The fault rectifies automatically once the grid frequency returns to the permissible range.
Fronius Symo Hybrid Inverter Code 567 — Power derating caused by overvoltage
The inverter is reducing its power output because the grid voltage has become excessively high. This is a protective measure. The fault rectifies automatically once the grid voltage returns to the permissible range.
Fronius Symo Hybrid Inverter Code 573 — Power derating caused by excessively low temperatures
A warning message on the display indicates that the inverter is reducing its power output due to excessively low internal temperatures. This is a protective measure, and the fault rectifies automatically.
Error 7 (Binary 0111) — RS transmission buffer overflow
The Fronius Solar Inverter's RS (serial) transmission buffer has overflowed, indicating too much data being sent for its capacity. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1, 2, and 4 specifically illuminated for the binary code.
Error 8 (Binary 1000) — RS receiver buffer overflow
The Fronius Solar Inverter's RS (serial) receiver buffer has overflowed, indicating too much data being received for its capacity. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LED 8 specifically illuminated for the binary code.
Error 9 (Binary 1001) — RS timeout
The Fronius Solar Inverter has experienced a timeout during RS (serial) communication, meaning it did not receive a response within an expected timeframe. This is indicated by LEDs 1, 2, 4, 8, and the State LED all lighting up steady red, with LEDs 1 and 8 specifically illuminated for the binary code.
Fronius Solar Battery not charging or discharging — SOC on web interface does not match
The Fronius Solar Battery is not performing its charging or discharging functions, and the State of Charge (SOC) shown on the web interface does not match the actual battery status. This points to a communication problem or the battery being off.
Fronius Solar Battery no longer displayed on web interface — Triangular view instead of square view
The Fronius Solar Battery's graphical representation on the web interface is incorrect or missing (shown as a triangular view instead of a square view). This indicates a communication error or the battery being switched off.
Fronius Solar Battery switched off with a SOC (state of charge) of 0% — Communication error
The Fronius Solar Battery is switched off and showing a 0% state of charge, which is accompanied by a communication error. This indicates a problem with the inverter's ability to communicate with or read the battery's status.
Fronius Solar Battery switches off during start-up procedure — Undefined operating status
The Fronius Solar Battery unexpectedly powers off while the inverter is going through its start-up process. This indicates an undefined or unstable operating condition for the battery.
Fronius Symo Hybrid Inverter Display total failure — Display remains dark
The inverter's display is completely dark, indicating a total loss of power to the display. This means all three methods of supplying power to the display have failed.
Fronius Solar Battery active, SOC > 90% and red LED flashing — Battery charging error
The Fronius Solar Battery is active and charged to over 90%, but a red LED is flashing, indicating an error with the battery charging process. This suggests a problem preventing proper charge management.
Fronius Hybrid Inverter State LED flashing red — Initialisation failed or Data error
The red 'State' LED on the Fronius hybrid inverter is flashing. If it starts flashing immediately after 'BusStart', it means initialisation failed. If it starts flashing during operation, it indicates a data error.
Fronius Hybrid Inverter State LED lights up red — General bus error (system error 10)
The red 'State' LED on the Fronius hybrid inverter is lit continuously, indicating a general bus error (system error 10). This means there's a problem with the internal communication system of the inverter.
Fronius Solar Battery State LED lights up red — General gateway error
The red 'State' LED on the Fronius Solar Battery is lit continuously, indicating a general error with the gateway communication. This could affect data exchange with the inverter or monitoring system.