Fronius inverters are renowned for their reliability and advanced diagnostic capabilities. However, like all sophisticated equipment, they can occasionally display error codes indicating specific issues. Understanding these Fronius error codes can aid in troubleshooting and ensuring your solar power system operates efficiently. Below is a comprehensive list of Fronius inverter error codes, their descriptions, and recommended actions:

Fronius Error Code 102: AC Voltage Too High

• Description: The AC voltage has exceeded permissible limits.
• Recommended Action: Check the grid voltage and circuit breakers. If the issue persists, contact your solar power system installer.

Fronius Error Code 103: AC Voltage Too Low

• Description: The AC voltage is below permissible limits.
• Recommended Action: Inspect the grid voltage and circuit breakers. If the problem continues, consult your installer.

Fronius Error Code 105: AC Frequency Too High                 

• Description: The AC frequency exceeds the allowable range.
• Recommended Action: Verify the mains frequency and ensure circuit breakers are ON. Persistent issues require professional assistance.

Fronius Error Code 106: AC Frequency Too Low

• Description: The AC frequency is below the allowable range.
• Recommended Action: Check the mains frequency and circuit breakers. Seek expert help if the issue remains unresolved.

Fronius Error Code 107: AC Grid Outside Allowed Limits

• Description: The grid parameters are beyond permissible limits.
• Recommended Action: Ensure the mains power is connected and circuit breakers are ON. If the fault persists, contact your installer.

Fronius Error Code 108: Stand-Alone Operation Detected

• Description: The inverter has detected islanding, indicating it is operating independently from the grid.
• Recommended Action: This is typically corrected automatically. If the problem persists, consult your installer.

Fronius Error Code 112: Residual Current Monitoring Unit (RCMU) Error

• Description: An issue with the RCMU has been detected.
• Recommended Action: Submit a maintenance service request to address this fault.

Fronius Error Code 141: Grid Frequency Jump Too High

• Description: A sudden significant change in grid frequency has been detected.
• Recommended Action: Monitor the system; if the error recurs frequently, contact your installer.

Fronius Error Code 301: Excess AC Current

• Description: The inverter has detected an overcurrent condition on the AC side.
• Recommended Action: This fault often resolves itself. If it persists, restart the system. Continuous issues warrant professional inspection.

Fronius Error Code 302: Excess DC Current

• Description: An overcurrent condition on the DC side has been detected.
• Recommended Action: Allow time for automatic correction. If unresolved, restart the system and consult your installer if necessary.

Fronius Error Code 303: DC Module Overheating

• Description: The DC module temperature has exceeded safe limits.
• Recommended Action: Ensure adequate ventilation around the inverter. If the fault persists, seek professional assistance.

Fronius Error Code 304: AC Module Overheating

• Description: The AC module temperature is too high.
• Recommended Action: Check for obstructions around the inverter and improve airflow. Persistent issues require contacting your installer.

Fronius Error Code 305: No Power Feed-In Despite Relay Closure

• Description: The inverter is not feeding power into the grid even though the relay is closed.
• Recommended Action: This may self-correct. If not, restart the system and consult your installer if the issue continues.

Fronius Error Code 306: PV Output Too Low to Feed

• Description: The photovoltaic output is insufficient for grid feeding.
• Recommended Action: This is common during low sunlight periods. If it occurs during peak sunlight, contact your installer.

Fronius Error Code 307: PV Output Too Low to Feed

• Description: Similar to Error 306, indicating low PV output.
• Recommended Action: Monitor the system during sunny periods; persistent issues necessitate professional evaluation.

Fronius Error Code 308: Intermediate Circuit Voltage Too High

• Description: The voltage in the intermediate circuit has exceeded safe limits.
• Recommended Action: This may resolve automatically. If not, restart the system and consult your installer if needed.

Fronius Error Code 309: DC Input Voltage MPPT 1 Too High

• Description: The DC input voltage for Maximum Power Point Tracker (MPPT) 1 is too high.
• Recommended Action: Verify the PV array configuration. If correct, seek professional assistance.

Fronius Error Code 311: Polarity of the DC Strings Reversed

• Description: The DC input polarity is incorrect.
• Recommended Action: Inspect and correct the wiring polarity. Consult your installer for assistance.

Fronius Error Code 313: DC Input Voltage MPPT 2 Too High

• Description: The DC input voltage for MPPT 2 exceeds permissible limits.
• Recommended Action: Check the PV string configuration and consult your installer if necessary.

Fronius Error Code 314: Current Sensor Calibration Timeout

• Description: The inverter has experienced a timeout during current sensor calibration.
• Recommended Action: Restart the system. If the error persists, contact your installer.

Fronius Error Code 315: AC Current Sensor Error

• Description: An issue with the AC current sensor has been detected.
• Recommended Action: Submit a maintenance service request to address this fault.

Fronius Error Code 317: Unbalanced Intermediate Circuit Voltage

• Description: The voltage within the intermediate circuit is unbalanced.
• Recommended Action: Restart the inverter. If the issue persists, contact your installer for further assistance.

Fronius Error Code 318: DC Back Current Detected

• Description: A reverse current has been detected on the DC side.
• Recommended Action: Disconnect the inverter from both AC and DC supplies, then reconnect. If the fault remains, consult your installer.

Fronius Error Code 325: Connection Area Overheating

• Description: The connection area temperature is too high.
• Recommended Action: Ensure the inverter's installation area is well-ventilated and free from obstructions. If overheating continues, seek professional assistance.

Fronius Error Code 326: Error with Fan 1

• Description: Malfunction detected in Fan 1.
• Recommended Action: Inspect Fan 1 for obstructions or damage. If the fan is faulty, it may need replacement by a qualified technician.

Fronius Error Code 327: Error with Fan 2

• Description: Malfunction detected in Fan 2.
• Recommended Action: Check Fan 2 for any issues. If problems persist, contact your installer for evaluation and potential replacement.

Fronius Error Code 401: AC Voltage Too High

• Description: The AC voltage has surpassed acceptable limits.
• Recommended Action: Monitor the grid voltage. If consistently high, consult your utility provider or installer to address the issue.

Fronius Error Codes 406-407: Temperature Sensor Fault

• Description: Faulty temperature sensor detected on AC module.
• Recommended Action: Restart the inverter. If the error persists, the sensor may require professional inspection or replacement.

Fronius Error Code 408: DC Component in Grid Too High

• Description: Excessive DC current detected feeding into the AC grid.
• Recommended Action: This is a critical issue. Immediately disconnect the inverter and contact your installer for urgent assistance.

Fronius Error Code 412: Fixed Voltage Mode Selected Instead of MPP

• Description: Incorrect voltage mode setting detected.
• Recommended Action: Reset the inverter to Maximum Power Point (MPP) tracking mode. If unsure, seek guidance from your installer.

Fronius Error Code 415: Safety Cut-Out Triggered

• Description: Safety mechanism activated via option card or RECERBO.
• Recommended Action: Restart the inverter. If the error recurs, consult your installer to diagnose the cause.

Fronius Error Code 416: Communication Error with Control System

• Description: No communication between power stage set and control system.
• Recommended Action: Restart the inverter. Persistent issues require professional evaluation.

Fronius Error Codes 417-419: Hardware ID Issues

• Description: Problems related to hardware identification detected.
• Recommended Action: The inverter firmware may need updating. Ensure sufficient daylight for the update process. If issues persist, the inverter may require replacement.

Fronius Error Code 420: Unable to Communicate with Hybrid Manager

• Description: Communication failure with the Hybrid Manager component.
• Recommended Action: Update the inverter firmware as above. If the problem remains, seek professional assistance.

Fronius Error Code 421: HID Range Error

• Description: Hardware ID range is incorrect.
• Recommended Action: Perform a firmware update. If unsuccessful, contact your installer.

Fronius Error Code 425: Communication Issue with Power Stage Set

• Description: Inverter cannot communicate with the power stage set.
• Recommended Action: Update the firmware. If the error persists, professional inspection is necessary.

Fronius Error Codes 426-428: Hardwire Fault

• Description: Detected faults in hardwired connections.
• Recommended Action: Update the inverter firmware. If issues continue, consult your installer.

Fronius Error Code 431: Software Fault

• Description: Detected software malfunction.
• Recommended Action: Conduct an AC reset by switching the AC circuit breaker off and on, then update the firmware. Persistent faults require professional assistance.

Fronius Error Code 436: Functional Incompatibility

• Description: Detected incompatibility in functionality.
• Recommended Action: Update the inverter firmware. If the issue remains, the inverter may need replacement.

Fronius Error Code 437: Power Stage Fault

• Description: Fault detected in the power stage component.
• Recommended Action: Firmware update is necessary. If unsuccessful, consult your installer.

Fronius Error Code 438: Functional Incompatibility

• Description: Similar to Error 436, indicating functional issues.
• Recommended Action: Update firmware. If problems persist, seek professional advice.

Fronius Error Code 443: Intermediate Circuit Voltage Too Low or Asymmetric

• Description: Voltage issues detected in the intermediate circuit.
• Recommended Action: Monitor the system; if the error persists, restart the inverter. Continuous issues require professional evaluation.

Fronius Error Code 445: Compatibility Fault

• Description: Invalid power stage set configuration detected.
• Recommended Action: As with Error 436, update firmware or consult your installer.

Fronius Error Code 448: Neutral Conductor Not Connected

• Description: The inverter has detected that the neutral conductor is not properly connected.
• Recommended Action: Verify the integrity of the neutral connection. If the connection is secure and the error persists, contact your installer for further assistance.

Fronius Error Code 450: Guard Cannot Be Found

• Description: The inverter is unable to detect the necessary safety guard.
• Recommended Action: Restart the inverter. If the error remains, consult with your installer to inspect and rectify the issue.

Fronius Error Code 451: Memory Fault Detected

• Description: An error has been detected in the inverter's memory.
• Recommended Action: Restart the inverter. If the fault persists, professional servicing may be required to address potential memory issues.

Fronius Error Code 452: Communication Problem Between Processors

• Description: Communication between internal processors has failed.
• Recommended Action: Restart the inverter. If the issue continues, contact your installer for a thorough inspection.

Fronius Error Code 453: Power Stage Set and Grid Voltage Not Compatible

• Description: The power stage set is incompatible with the grid voltage.
• Recommended Action: Restart the system and monitor over several days. If the fault persists, submit a maintenance service request.

Fronius Error Code 454: Power Stage Set and Grid Frequency Not Compatible

• Description: The power stage set is incompatible with the grid frequency.
• Recommended Action: Restart the system and monitor over several days. If the fault persists, submit a maintenance service request.

Fronius Error Code 456: Anti-Islanding Function Not Implemented Correctly

• Description: The anti-islanding protection function is malfunctioning.
• Recommended Action: Restart the system and monitor over several days. If the fault persists, submit a maintenance service request.

Fronius Error Code 457: Grid Relay Sticking or Neutral Conductor Ground Voltage Too High

• Description: The grid relay is sticking, or the neutral conductor's ground voltage exceeds acceptable limits.
• Recommended Action: Send an installer to check grounding. The neutral conductor ground voltage must be less than 30V. Submit a maintenance service request.

Fronius Error Codes 458-459: Issues When Recording the Measuring Signal

• Description: Errors have occurred during the recording of measuring signals.
• Recommended Action: Restart the system. Check for firmware updates. If the fault persists after 24 hours, submit a maintenance service request.

Fronius Error Code 460: Reference Voltage Source for DSP Out of Tolerance

• Description: The reference voltage source for the Digital Signal Processor (DSP) is operating outside acceptable limits.
• Recommended Action: Restart the system. Check for firmware updates. If the fault persists after 24 hours, submit a maintenance service request.

Fronius Error Code 461: Error with DSP Data Memory

• Description: An error has been detected in the DSP's data memory.
• Recommended Action: Restart the system. Check for firmware updates. If the fault persists after 24 hours, submit a maintenance service request.

Fronius Error Code 462: Fault with the DC Feed Monitoring Routine

• Description: The routine monitoring the DC feed has encountered a fault.
• Recommended Action: Restart the system. Check for firmware updates. If the fault persists after 24 hours, submit a maintenance service request.

Fronius Error Code 463: Reversed AC Polarity

• Description: The AC connector has been incorrectly inserted, resulting in reversed polarity.
• Recommended Action: This issue typically arises if the system has been tampered with or after onsite electrical work. Submit a maintenance service request to address the problem.

Fronius Error Code 474: RCMU Sensor Faulty

• Description: The Residual Current Monitoring Unit (RCMU) sensor is malfunctioning.
• Recommended Action: Submit a maintenance service request for professional evaluation and potential replacement.

Fronius Error Code 475: Insulation Fault Between Solar Panel and Ground

• Description: A fault has been detected in the insulation between the solar panel and ground.
• Recommended Action: Submit a maintenance service request to have the insulation inspected and repaired as necessary.

Fronius Error Code 476: Driver Supply Voltage Too Low

• Description: The supply voltage for the driver circuit is insufficient.
• Recommended Action: Restart the system. If the error persists, submit a maintenance service request for further investigation.

Fronius Error Code 479: Immediate Circuit Relay Has Switched Off

• Description: The immediate circuit relay has unexpectedly switched off.
• Recommended Action: Restart the system. If the error remains after a few hours, submit a maintenance service request.

Fronius Error Codes 480-481: Inverter Firmware Needs to Be Updated

• Description: The inverter firmware is outdated and requires an update.
• Recommended Action: Ensure the update is performed during daylight hours to allow completion. If the update fails or the error persists, submit a maintenance service request.

Fronius Error Code 482: Setup Phase After Initial Startup Interrupted

• Description: The initial setup phase was interrupted.
• Recommended Action: Perform a full system restart: turn off the AC circuit breaker, wait 5 minutes, turn it back on, then after another 5-10 minutes, restart the system. Conduct this during daylight hours.

Fronius Error Code 483: Voltage UDC Fixed on MPP2 String Out of Limit

• Description: The fixed voltage on the Maximum Power Point 2 (MPP2) string is outside acceptable limits
• Send installer to site to check MPP settings. If correct and persisting, complete full restart including AC circuit breaker, if persisting contact Fronius. Submit a maintenance request.

Fronius Error Code 484: Intermediate Circuit Voltage Too High

• Description: The voltage in the intermediate circuit has exceeded the permissible limit.
• Recommended Action: This fault is typically temporary and may resolve automatically. If the error persists, restart the inverter. Should the issue continue, contact your installer for further assistance.

Fronius Error Code 485: CAN Transmit Buffer Full

• Description: The inverter's Controller Area Network (CAN) communication buffer is full, indicating a communication bottleneck.
• Recommended Action: Perform an AC reset by turning off the AC circuit breaker, waiting for 5 minutes, and then turning it back on. If the error persists, contact your installer for further evaluation.

Fronius Error Code 489: Permanent Intermediate Circuit Capacitor Overvoltage

• Description: A sustained overvoltage condition has been detected in the intermediate circuit capacitor.
• Recommended Action: This issue requires professional attention. Submit a maintenance service request to have the inverter inspected and repaired as necessary.

Fronius Error Code 502: Insulation Fault on the Solar Panels

• Description: An insulation fault has been detected between the solar panels and the ground.
• Recommended Action: While this fault may correct itself, if it persists, restart the system. If the error remains, submit a maintenance service request for a thorough inspection.

Fronius Error Code 509: No Energy Fed into the Grid in the Last 24 Hours

• Description: The inverter has not fed any energy into the grid over the past 24 hours.
• Recommended Action: Ensure there have been no power outages in your area. If the issue persists for more than two days, submit a maintenance service request.

Fronius Error Code 515: Unable to Communicate with Filter

• Description: The inverter is unable to establish communication with the filter component.
• Recommended Action: If this fault persists after a system restart, submit a maintenance service request for further investigation.

Fronius Error Code 516: Unable to Communicate with the Storage Unit

• Description: The inverter cannot communicate with the connected storage unit.
• Recommended Action: Restart the system. If the error continues, submit a maintenance service request to address the communication issue.

Fronius Error Code 517: No Energy Fed into the Grid by MPPT 1 in the Past 24 Hours

• Description: Maximum Power Point Tracker (MPPT) 1 has not fed energy into the grid in the last 24 hours.
• Recommended Action: Check for obstructions blocking the inverter's air openings and remove them if present. If the fault persists after ensuring proper ventilation, restart the system. Should the issue continue, the inverter may require servicing or replacement.

Fronius Error Code 518: Internal DSP Fault

• Description: An internal fault has been detected in the Digital Signal Processor (DSP).
• Recommended Action: Ensure the inverter's air openings are unobstructed. If the fault persists after clearing any blockages and restarting the system, submit a maintenance service request.

Fronius Error Code 519: Unable to Communicate with Storage Unit

• Description: Similar to Error 516, the inverter is unable to communicate with the storage unit.
• Recommended Action: After ensuring proper ventilation and performing a system restart, if the error persists, submit a maintenance service request.

Fronius Error Code 520: No Energy Fed into the Grid by MPPT 2 in the Past 24 Hours

• Description: MPPT 2 has not fed energy into the grid in the last 24 hours.
• Recommended Action: As with Error 517, check for and remove any obstructions to the inverter's air openings. If the fault persists, restart the system. Continued issues may necessitate servicing or replacement of the inverter.

Fronius Error Code 522: DC Voltage Low in String 1

• Description: The direct current (DC) voltage in String 1 is lower than expected.
• Recommended Action: Ensure there are no blockages to the inverter's air openings. If the fault persists after clearing any obstructions and restarting the system, submit a maintenance service request.

Fronius Error Code 523: DC Voltage Low in String 2

• Description: The DC voltage in String 2 is lower than expected.
• Recommended Action: Similar to Error 522, ensure proper ventilation and restart the system. If the issue continues, submit a maintenance service request.

Fronius Error Codes 528-529: Functional Incompatibility

• Description: One or more printed circuit boards (PCBs) in the inverter are not compatible with each other, possibly due to a recent replacement.
• Recommended Action: Update the inverter firmware during daylight hours to ensure completion. If the error persists after the update, submit a maintenance service request.

Fronius Error Code 560: Grid Frequency Excessively High Causing Derating

• Description: The grid frequency has become excessively high, leading to a reduction in inverter power output.
• Recommended Action: This fault typically resolves itself. If it persists for an extended period, submit a maintenance service request.

Fronius Error Code 564: Functional Incompatibility

• Description: Similar to Errors 528-529, indicating incompatible PCBs within the inverter.
• Recommended Action: Update the inverter firmware during daylight hours. If the error remains, submit a maintenance service request.

Fronius Error Code 566: Arc Detector Deactivated

• Description: The arc detection function has been deactivated.g
• Recommended Action: Press the 'Enter' button (fourth button from the left) on the inverter and wait 5 minutes. The error should clear. If it persists, submit a maintenance service request.

Fronius Error Code 567: Grid Voltage Dependent Power Reduction Active

• Description: The inverter has detected that the grid voltage is higher than acceptable limits and has reduced its power output to maintain grid stability.
• Recommended Action: This is a protective measure and typically does not indicate a fault within the inverter. However, if this state persists frequently, it may indicate an issue with the grid voltage. Contact your installer to assess and address potential grid voltage problems.

Fronius Error Code 601: CAN Bus is Full

• Description: The Controller Area Network (CAN) communication bus is overloaded, preventing proper data transmission.
• Recommended Action: Update the inverter firmware to the latest version. Ensure the update is performed during daylight hours to allow for completion. If the error persists after the update, submit a maintenance service request.

Fronius Error Code 603: AC Module Temperature Sensor Faulty (L3)

• Description: The temperature sensor on the AC module for phase L3 is malfunctioning.
• Recommended Action: The inverter will attempt to reconnect automatically. If this state code recurs, contact your solar power system installer for further evaluation

Fronius Error Code 604: DC Module Temperature Sensor Faulty

• Description: The temperature sensor on the DC module is faulty or not connected.
• Recommended Action: The inverter will attempt to reconnect automatically. If the error persists, contact your installer for a thorough inspection and potential sensor replacement.

Fronius Error Code 607: RCMU Error

• Description: An error has been detected in the Residual Current Monitoring Unit (RCMU).
• Recommended Action: Press the 'Enter' button (fourth button from the left) to reset the status code. The inverter should resume feeding energy into the grid. If the error recurs, inspect the entire solar system for damage and consult your installer.

Fronius Error Code 608: Functional Incompatibility

• Description: One or more printed circuit boards (PCBs) in the inverter are not compatible with each other, possibly due to a recent replacement.
• Recommended Action: Update the inverter firmware to ensure compatibility among components. Perform the update during daylight hours to allow for completion. If the error persists after the update, contact your local Fronius Service Partner.

Fronius Error Code 609: Configuration Value Out of Limits

• Description: A configuration parameter is set outside the permissible range.
• Recommended Action: Submit a maintenance service request to have the configuration settings reviewed and corrected by a professional.

Fronius Error Codes 701-716: Internal Processor Status Information

• Description: These codes provide information about the internal processor status and may indicate various internal issues.
• Recommended Action: If any of these state codes are displayed persistently, notify your local Fronius Service Partner for a detailed assessment.

Fronius Error Code 721: EEPROM Re-Initialised

• Description: The Electrically Erasable Programmable Read-Only Memory (EEPROM) has been re-initialised, possibly due to a reset or error.
• Recommended Action: Acknowledge the state code. If it continues to appear, contact your local Fronius Service Partner for further assistance.

Fronius Error Codes 722-730: Internal Processor Status Information

• Description: Similar to codes 701-716, these indicate specific internal processor statuses.
• Recommended Action: Persistent display of these codes warrants contacting your local Fronius Service Partner for evaluation.

Fronius Error Code 731: USB Flash Drive Not Supported

• Description: The connected USB flash drive is not supported by the inverter.
• Recommended Action: Check or replace the USB flash drive with one that meets the inverter's compatibility requirements. If the error persists, contact your local Fronius Service Partner.

Fronius Error Code 732: Initialisation Error – Overcurrent on USB Stick

• Description: An overcurrent condition has been detected on the USB flash drive.
• Recommended Action: Remove the USB flash drive and inspect it for damage. Replace if necessary. If the error continues, consult your service partner.

Fronius Error Code 733: No USB Flash Drive Connected

• Description: The inverter expects a USB flash drive but none is detected.
• Recommended Action: Ensure a compatible USB flash drive is properly connected. If the error persists, contact your service partner.

Fronius Error Code 734: Update File Not Recognised or Not Present

• Description: The inverter cannot recognise the update file on the USB flash drive.
• Recommended Action: Verify the update file's name and format. If correct and the error persists, contact your service partner.

Fronius Error Code 735: Update File Does Not Match Device or Is Too Old

• Description: The update file is incompatible with the inverter or is outdated.
• Recommended Action: Download the latest firmware update from Fronius. If the error persists, consult your service partner.

Fronius Error Code 736: Write or Read Error Occurred

• Description: An error occurred while reading from or writing to the USB flash drive.
• Recommended Action: Check the USB flash drive for issues or replace it. Avoid unplugging the USB drive while the 'Data Transmission' LED is active. If the error persists, contact your service partner.

Fronius Error Code 737: File Could Not Be Opened

• Description: The inverter is unable to open a required file on the USB flash drive.
• Recommended Action: Remove and reinsert the USB flash drive. Check the file integrity. If the issue continues, consult your service partner.

Fronius Error Code 738: Unable to Save Log File

• Description: The inverter is unable to save the log file to the USB flash drive.
• Recommended Action: Ensure the USB flash drive has sufficient free space and is functioning properly. If the issue persists, contact your local Fronius Service Partner for assistance.

Fronius Error Code 740: Error in File System

• Description: An error has been detected in the file system of the USB flash drive.
• Recommended Action: Format the USB flash drive or replace it with a new one. If the problem continues, consult your Fronius Service Partner.

Fronius Error Code 741: Error Recording Logging Data

• Description: The inverter encountered an error while attempting to record logging data.
• Recommended Action: Check the USB flash drive for errors and ensure it is properly connected. If the issue persists, contact your service partner.

Fronius Error Code 743: Error During Update

• Description: An error occurred during the firmware update process.
• Recommended Action: Retry the update with a properly prepared USB flash drive. If the error recurs, consult your Fronius Service Partner.

Fronius Error Code 745: Update File Corrupt

• Description: The firmware update file on the USB flash drive is corrupt.
• Recommended Action: Download a new update file from the official Fronius website and attempt the update again. If the problem persists, contact your service partner.

Fronius Error Code 746: Error While Updating

• Description: An unspecified error occurred during the update process.
• Recommended Action: Ensure the USB flash drive is functioning correctly and contains the correct update file. Retry the update. If the error continues, consult your service partner.

Fronius Error Code 751: Time Lost

• Description: The inverter has lost its internal clock settings.
• Recommended Action: Reset the time and date on the inverter. If the issue persists, submit a maintenance service request.

Fronius Error Code 752: Communication Error with Real-Time Clock Module

• Description: The inverter is unable to communicate with the real-time clock module.
• Recommended Action: Reset the time and date on the inverter. If the error persists, contact your Fronius Service Partner.

Fronius Error Code 753: Real-Time Clock Module in Emergency Mode

• Description: The real-time clock module has entered emergency mode due to an error.
• Recommended Action: Reset the time and date on the inverter. If the issue continues, consult your service partner.

Fronius Error Codes 754-755: Information About Internal Processor Status

• Description: These codes provide information about the internal status of the inverter's processors.
• Recommended Action: If these codes are displayed persistently, notify your local Fronius Service Partner for further assessment.

Fronius Error Code 757: Real-Time Clock Module Hardware Error

• Description: A hardware fault has been detected in the real-time clock module.
• Recommended Action: Contact your Fronius Service Partner for diagnosis and potential replacement of the module.

Fronius Error Code 758: Real-Time Clock Module in Emergency Mode

• Description: Similar to Error 753, indicating the real-time clock module has entered emergency mode.
• Recommended Action: Reset the time and date on the inverter. If the error persists, consult your service partner.

Fronius Error Code 760: Internal Hardware Fault

• Description: An internal hardware error has been detected within the inverter.
• Recommended Action: Submit a maintenance service request to have the inverter inspected and repaired as necessary.

Fronius Error Codes 761-765 & 767: Information About Internal Processor Status

• Description: These codes indicate specific internal processor statuses and may point to various internal issues.
• Recommended Action: Persistent display of these codes warrants contacting your local Fronius Service Partner for evaluation.

Fronius Error Code 766: Emergency Power Derating Triggered

• Description: The inverter has reduced its power output due to an emergency condition.
• Recommended Action: Restart the inverter. If the problem persists, submit a maintenance service request.

Fronius Error Code 775: PMC Power Stage Set Unavailable

• Description: The inverter's Power Management Controller (PMC) power stage set is unavailable.
• Recommended Action: Press the 'Enter' button (fourth button from the left) on the inverter. If the problem persists, contact your Fronius Service Partner.

Fronius Error Code 776: Device Type Invalid

• Description: The inverter has detected an invalid device type.
• Recommended Action: Press the 'Enter' button on the inverter. If the issue continues, consult your service partner.

Fronius Error Code 779: CAN Bus Transmission Error

• Description: An error has occurred in the Controller Area Network (CAN) bus communication.
• Recommended Action: Contact your Fronius Service Partner for further diagnosis and resolution.

Fronius Error Codes 781-794: Information About Internal Processor Status

• Description: These codes provide information about the internal status of the inverter's processors.
• Recommended Action: If these codes are displayed persistently, notify your local Fronius Service Partner for further assessment.

Regular monitoring of your Fronius inverter and prompt attention to any error codes can help maintain optimal performance and longevity of your solar power system. If you are unsure or having any fronius inverter issues, reach out to us at Solair Electrical anytime on 0405 685 441