Fronius Error Codes
Common Fronius State codes, including the Australian Volt-Watt and Volt-VAr grid-protection states, explained for owners and installers.
30 of 30 codes
About this fault librarySources · scope
A reference compiled by Wattbench from the current Fronius Symo / Eco operating instructions. Fronius reports faults as numbered State codes on the display or in Solar.web. This library preserves the Symo / Eco meaning of each listed state; the same number can mean something different on another Fronius family, so confirm the exact model before acting. Safety note: owners should record the state and stop at safe visual observations. DC/AC isolation, electrical measurements, settings, wiring and opening equipment are licensed-worker tasks, completed under the exact model and site procedure.
- 30 Fronius fault and alarm codes, documented for the trade.
- Compiled from published documentation and field references; Wattbench is independent and not affiliated with Fronius.
- Codes involving DC/AC isolation, wiring or opening the unit are licensed electrical work. Isolate safely and follow AS/NZS procedure.
Resolution text is manufacturer/service context, not permission for an owner to perform electrical work. Stop at visible observations unless the exact product instructions identify an owner control. Isolation, configuration, testing, opening equipment and wiring are for an appropriately licensed worker and, where required, an SAA-accredited person. Where a card says Product fit is unknown, treat it as brand-level guidance and confirm the exact model, role, regional variant, firmware and current manual before acting.
- 102
AC voltage too high
The grid voltage measured at the inverter is above the safe threshold, so it disconnects to protect itself. The single most common Fronius state.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 102: AC voltage too high
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 103
AC voltage too low
The grid voltage is below the inverter's acceptable range.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 103: AC voltage too low
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 105
AC frequency too high
The grid frequency is above the acceptable range.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 105: AC frequency too high
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 106
AC frequency too low
The grid frequency is below the acceptable range.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 106: AC frequency too low
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 107
No AC grid / outside limits
No grid is available, or several grid parameters are out of range, so the inverter can't synchronise.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 107: No AC grid / outside limits
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 108
Stand-alone operation detected
The inverter detected an islanding condition (running disconnected from the grid).
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 108: Stand-alone operation detected
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Note the state code, time and whether the property and neighbourhood have normal grid supply. The inverter should reconnect automatically when the grid returns to its permitted range; contact your installer if the state persists or repeats.
Installer remedy
Check the grid connection and measured supply condition against the approved operating settings. If the supply is normal but the state persists, follow the Symo/Eco service path and escalate through the authorised network or Fronius process as applicable.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 112
RCMU error
An error in the residual-current monitoring unit (RCMU).
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 112: RCMU error
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 301
Overcurrent (AC)
A momentary AC over-current inside the inverter.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 301: Overcurrent (AC)
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the state code and wait for the inverter's automatic start-up attempt. Do not operate isolators or open the inverter; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 302
Overcurrent (DC)
A momentary DC over-current inside the inverter.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 302: Overcurrent (DC)
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the state code and wait for the inverter's automatic start-up attempt. Do not operate isolators or open the inverter; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 303
DC module over-temperature
The DC power stage is too hot: usually blocked ventilation, high ambient temperature, or units mounted too close.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 303: DC module over-temperature
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, check that the external cooling openings are not visibly obstructed and allow the inverter to cool. Do not open the unit; contact your installer if the state persists.
Installer remedy
Purge the cooling openings and heat sink under the product maintenance procedure. If the temperature state returns after airflow is restored, arrange Fronius-trained service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 304
AC module over-temperature
The AC power stage is too hot, same causes as 303.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 304: AC module over-temperature
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, check that the external cooling openings are not visibly obstructed and allow the inverter to cool. Do not open the unit; contact your installer if the state persists.
Installer remedy
Purge the cooling openings and heat sink under the product maintenance procedure. If the temperature state returns after airflow is restored, arrange Fronius-trained service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 306 · POWER LOW
PV output too low
The intermediate-circuit voltage is too low to feed in, usually just low light.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 306 · POWER LOW: PV output too low
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Wait for stronger daylight. This state is expected when solar input is too low and should clear automatically; contact your installer if it remains in good sunlight.
Installer remedy
Confirm whether the state occurs only at sunrise, sunset or low irradiance. If it recurs with sufficient insolation, preserve the state history and have the system engineer check the PV input under the exact-model procedure.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 307 · DC LOW
DC input voltage too low
The DC input voltage is too low for grid feed-in.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 307 · DC LOW: DC input voltage too low
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Wait for stronger daylight. This state is normal around sunrise and sunset and should clear automatically; contact your installer if it remains in good sunlight.
Installer remedy
Confirm whether the state occurs only at sunrise, sunset or low irradiance. If it recurs with sufficient insolation, preserve the state history and have the system engineer check the PV input under the exact-model procedure.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 309
DC input voltage MPPT 1 too high
The DC voltage on tracker 1 exceeds the inverter's maximum.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 309: DC input voltage MPPT 1 too high
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Leave the inverter and PV wiring alone, record that MPPT 1 is named and contact your installer promptly. Do not reset the inverter or operate isolators to test whether it clears.
Installer remedy
Treat this as an exact-model Symo/Eco DC-input overvoltage state. Under the approved safe-isolation procedure, verify the MPPT 1 string design against the exact inverter input limit before reconnection; escalate through the Fronius service path if required.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 311
DC string polarity reversed
A DC string is wired with reversed polarity.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 311: DC string polarity reversed
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Leave the inverter and PV wiring alone, record the state and contact your installer promptly. Do not attempt to correct or test a live PV string.
Installer remedy
Under the approved safe-isolation procedure, identify the affected Symo/Eco string and correct its reversed polarity before reconnection. Preserve the state history and exact model details.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 313
DC input voltage MPPT 2 too high
The DC voltage on tracker 2 exceeds the inverter's maximum.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 313: DC input voltage MPPT 2 too high
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Leave the inverter and PV wiring alone, record that MPPT 2 is named and contact your installer promptly. Do not reset the inverter or operate isolators to test whether it clears.
Installer remedy
Treat this as an exact-model Symo/Eco DC-input overvoltage state. Under the approved safe-isolation procedure, verify the MPPT 2 string design against the exact inverter input limit before reconnection; escalate through the Fronius service path if required.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 326 · 327
Fan error
A cooling-fan fault (fan 1 or fan 2).
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 326 · 327: Fan error
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, check that the external fan area is not visibly obstructed. Do not touch the fan or open the inverter; contact your installer if the state remains.
Installer remedy
Inspect the named fan and ventilation path under the product maintenance procedure. If the fan state persists, arrange replacement through a Fronius-trained service technician.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 425
No communication with power stage
The control can't communicate with the power-stage set.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 425: No communication with power stage
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Update the inverter firmware through the authorised procedure where applicable. If communication with the power-stage set remains unavailable, arrange Fronius-trained service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 436
Board incompatibility
Functional incompatibility between PC boards (often after a component replacement).
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 436: Board incompatibility
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Confirm the installed boards are compatible and update inverter firmware through the authorised procedure. If the incompatibility remains, arrange Fronius-trained service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 443
Intermediate-circuit voltage fault
The intermediate-circuit voltage is too low or asymmetric.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 443: Intermediate-circuit voltage fault
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 447
Insulation fault
An insulation fault in the inverter or PV array.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 447: Insulation fault
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the state code, time and weather conditions. Do not reset the inverter or touch PV wiring; arrange a licensed inspection if the insulation state remains or returns.
Installer remedy
Follow the Symo/Eco insulation-fault diagnostic under the approved safe-isolation procedure. If the state persists, arrange assessment by a Fronius-trained service technician.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 448
Neutral conductor not connected
The neutral wire is not connected.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 448: Neutral conductor not connected
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Do not reset the inverter or touch the switchboard or wiring. Record the state and arrange attendance by your installer or a licensed electrician.
Installer remedy
Under the approved safe-isolation procedure, verify and rectify the neutral connection before returning the Symo/Eco inverter to service. Escalate through Fronius service if the state remains.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 450
Guard cannot be found
The safety guard module was not detected.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 450: Guard cannot be found
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 452
Processor communication error
A communication error between the inverter's processors.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 452: Processor communication error
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 463
Reversed AC polarity
The AC connector is inserted incorrectly or the phase is reversed.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 463: Reversed AC polarity
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Do not reset the inverter or touch the AC connector or switchboard wiring. Record the state and arrange attendance by your installer or a licensed electrician.
Installer remedy
Under the approved safe-isolation procedure, verify the Symo/Eco AC connector orientation and phase polarity, rectify the connection and complete the documented commissioning checks before return to service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 502
Insulation error on the PV modules
An insulation fault between the array (DC+/DC−) and earth, frequently in damp or rainy weather.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 502: Insulation error on the PV modules
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the state code, time and weather conditions. Do not reset the inverter or touch PV connectors or wiring; arrange a licensed inspection if the state remains or returns.
Installer remedy
Follow the Symo/Eco PV-module insulation diagnostic under the approved safe-isolation procedure. Inspect the array and cabling as directed, and return the system to service only after the insulation condition is resolved.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 509
No feed-in for 24 hours
The inverter hasn't fed energy into the grid in the past 24 hours.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 509: No feed-in for 24 hours
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, note whether the modules are visibly obstructed and whether another state is active. Contact your installer if there has still been no feed-in after normal daylight returns.
Installer remedy
Acknowledge the state, check the feed-in conditions identified by the manual and review other active states. If generation does not resume under normal conditions, follow the exact-model diagnostic path.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 516
No communication with storage unit
The inverter can't communicate with the connected battery/storage unit.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 516: No communication with storage unit
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record the exact state code, inverter model and time. Do not operate isolators, open the inverter or touch wiring; contact your installer if the state remains or returns.
Installer remedy
Follow the exact-model diagnostic procedure and preserve the state history. If the state remains, arrange assessment by a Fronius-trained service technician rather than repeatedly restarting the inverter.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 517
Power derating by temperature
The inverter is reducing output because it's too hot.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 517: Power derating by temperature
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
From a safe position, check that the external cooling openings are not visibly obstructed and allow the inverter to cool. Do not open the unit; contact your installer if derating persists.
Installer remedy
Purge the cooling openings and heat sink under the product maintenance procedure. If temperature derating remains after airflow is restored, arrange Fronius-trained service.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
- 567
Volt-Watt power reduction (GVDPR)
Grid-Voltage-Dependent Power Reduction (Volt-Watt mode) is active. The inverter is curtailing output because the grid voltage is high.
Product fit · Confirmed · Fronius Symo / Fronius Eco
Show field stepsHide field steps for 567: Volt-Watt power reduction (GVDPR)
Product fit
Fronius Symo / Fronius Eco · Three-phase string inverter
Confirmed · Manual 044-17072025 · AU/region not confirmed · Firmware not documented
Safe checks now
Record when the state appears and wait for automatic recovery as grid voltage returns to range. Contact your installer if the power reduction is frequent or prolonged.
Installer remedy
Confirm the measured grid voltage and preserve the approved protection profile. If the state repeats, have the system engineer assess the grid connection and escalate a confirmed supply issue through the authorised network process.
Remedy sourceSymo/Eco manual
Manufacturer / escalation handoff
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Frequently asked
- Where do these Fronius fault codes come from?
- Compiled from publicly available Fronius inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Fronius.
- Which of these can I clear on site?
- Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.
- The exact code isn't listed. Why not?
- Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.
- How current is this reference?
- This reference was last reviewed on 2 August 2026. We revise entries when the underlying manufacturer documentation changes.
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