Fronius Primo Solar Inverter

This status code appears for about 4 seconds, indicating that the inverter has briefly detected an electrical arc in the PV system. It does not cause a permanent interruption to power feed.

This code is displayed directly after code 240, indicating a confirmed arc detection. The inverter disconnects from the grid for safety reasons. You must check the PV system for damage before resetting.

This status code is displayed after you have reset status code 241. The inverter is now attempting to resume feeding power into the grid.

The inverter's internal arc detector failed its self-test and has disconnected from the grid. This requires an AC reset to re-attempt the test.

The current sensor within the arc detector is defective. The inverter disconnects from the grid for safety. This indicates an internal hardware fault that needs professional attention.

The arc detector itself is reported as defective. The inverter may disconnect from the grid. This indicates a problem with the safety monitoring system.

The inverter briefly interrupted its grid power feed operation because of an overcurrent on the AC side. The inverter will attempt to restart automatically.

The inverter briefly interrupted its operation due to an overcurrent detected on the DC input side from the solar panels. The inverter will attempt to restart automatically.

The inverter briefly interrupted grid power feed operation because its power stage set became too hot. The inverter will return to its startup phase and attempt to cool down.

The inverter has detected that its interior temperature is too high, causing a brief interruption in operation. It will attempt to cool down and restart automatically.

The inverter has encountered a software problem and is unable to feed energy into the grid. This usually requires a reset and potentially a firmware update.

One or more PC boards in the inverter are not compatible with each other, possibly after a component replacement. The inverter will automatically attempt to connect again and resume feeding energy.

This indicates a problem with one of the inverter's internal power modules. The inverter may not feed energy into the grid due to this internal hardware fault.

Similar to 436, this indicates that one or more PC boards in the inverter are not compatible. The inverter will attempt to reconnect and resume grid power feed.

The inverter is detecting that its intermediate circuit voltage is either too low or unsymmetrical, which prevents it from feeding energy into the grid.

The inverter's limit value settings are outside the permissible range, preventing it from feeding energy into the grid for safety reasons. This usually requires a firmware update.

An insulation fault has been detected in the photovoltaic system. This is a critical safety issue that can prevent the inverter from operating.

The inverter is detecting that the neutral conductor on its AC side is not properly connected. This is a critical wiring issue that prevents proper grid power feed.

This indicates that an internal safety component, referred to as a "guard," is either missing or not functioning correctly within the inverter. This prevents proper operation.

An internal memory error has been detected within the inverter. The inverter will automatically attempt to reconnect to the grid and resume operation.

There is a communication problem between the internal processors within the inverter. This can prevent proper operation and grid power feed.

The inverter detected a temporary error with the grid voltage. This is usually a transient issue and does not cause a permanent interruption.

The inverter detected a temporary error with the grid frequency. This is usually a transient issue and does not cause a permanent interruption.

The inverter's anti-islanding safety function, which prevents it from feeding power when the grid is down, has stopped running properly. This is a critical safety fault.

The inverter's internal grid relay is stuck, preventing it from feeding energy into the grid. This is a hardware fault and the inverter will not operate safely.

The inverter is having an error receiving the necessary measuring signal to perform its insulation test. This can prevent it from starting or operating safely.

The reference power source for the inverter's Digital Signal Processor (DSP) is operating outside its acceptable tolerances, indicating an internal power supply problem.

An error has occurred in the data memory of the inverter's Digital Signal Processor (DSP). This can affect the inverter's ability to process data and operate correctly.

An error has occurred in the inverter's routine for monitoring the DC power input. This can lead to incorrect readings or prevent the inverter from feeding power.

The inverter has detected that the AC polarity is reversed, or the AC connector is plugged in incorrectly. This is a severe wiring error and prevents operation.

The sensor for the Residual Current Monitoring Unit (RCMU) is faulty, preventing the inverter from feeding energy into the grid. This is a safety-critical component.

An insulation error has been detected, specifically a connection issue between a solar module and ground. This is a critical safety issue and prevents grid power feed.

The supply voltage for an internal driver component within the inverter is too low. This indicates a problem with the inverter's internal power supply.

The relay for the intermediate circuit voltage has switched off. The inverter will automatically attempt to reconnect to the grid and resume feeding energy.

One or more PC boards in the inverter are not compatible with each other, possibly after a component replacement. The inverter will not feed energy into the grid.

The inverter's commissioning process has not been completed, which prevents it from feeding energy into the grid. This needs to be finished before operation.

The fixed DC voltage (U DCfix) setting for the second Maximum Power Point Tracker (MPPT2) string is outside its valid operating range, preventing the inverter from feeding power.

The internal CAN communication buffer is full, indicating a potential overload or issue with internal data transmission. This prevents the inverter from feeding energy into the grid.

This code indicates a persistent overvoltage on the intermediate circuit capacitor (five 479 status codes in a row). The inverter is not feeding any energy into the grid due to this critical internal fault.

A warning message appears on the display, indicating an insulation error detected on the solar modules. This is a safety concern that can affect operation.

A warning message indicates that the inverter has not fed any energy into the grid within the last 24 hours. This could be due to external conditions or an underlying fault.

A warning message appears on the display, indicating that there is no internal communication with the filter unit. This can affect inverter performance.

A warning message indicates that the inverter cannot communicate with its internal memory unit. This can lead to data loss or incorrect operation.

A warning message appears on the display, indicating the inverter is reducing its power output because it's getting too hot. This is a protective measure to prevent damage.

A warning message on the display indicates that the DC voltage from the first solar string (MPPT1) is too low. This can lead to reduced power generation from your solar panels.

A warning message on the display indicates that the DC voltage from the second solar string (MPPT2) is too low. This can lead to reduced power generation from your solar panels.

This indicates that one or more PC boards inside the inverter are not compatible with each other, possibly after a replacement. This can lead to error displays or malfunctions in the inverter.

The status code is displayed when the grid frequency is excessively high. The inverter reduces its power output as a protective measure until the grid frequency returns to the permissible range.

This status code is displayed every day when the internal arc detector has been manually switched off, for example, if an external arc monitoring system is in use. This is not an error.

This indicates a configuration error where the inverter number is assigned twice, possibly in a multi-inverter system. This requires correcting the number in the setup menu.

A warning message appears on the display, indicating that the inverter's EEPROM (internal memory) was either reinitialized or is defective. This can affect system configuration and data.

A warning message indicates that the inserted USB stick is not supported by the inverter. This can happen if the USB stick's format or type is incompatible with the device.

This indicates that the USB stick or device connected to the inverter's USB port is drawing too much current. The inverter detects an overcurrent condition to protect itself.

A warning message appears on the display indicating that no USB stick is detected in the inverter's USB port, even if one is expected or needed for an operation.

A warning message indicates that the update file needed for a software update is either not detected or unavailable on the USB stick. This prevents the update process from starting.

A warning message appears on the display, and the update process is canceled because the update file on the USB stick is either not for this device or is too old.

A warning message indicates that an error occurred while the inverter was trying to write or read data from the USB stick. This can prevent logging or updates from completing.

A warning message indicates that the inverter could not save a log file to the USB stick. This usually happens if the stick is write-protected or its memory is full.

A warning message indicates that an error occurred during the software update process. This means the update did not complete successfully.

A warning message appears, and the update process is canceled because the update file itself is faulty or corrupted. This prevents the update from proceeding.