SMA Error Codes

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.

• 101 · 102 · 103 · 105

  Grid voltage / impedance too high

  The grid voltage or grid impedance at the inverter's connection point is too high, so it disconnects.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 101 · 102 · 103 · 105: Grid voltage / impedance too high

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  Usually a network issue rather than a faulty inverter. Confirm the country dataset is correct and the grid voltage is in range; if it's frequently high, contact your installer or network operator. It self-restores when voltage returns to range.

  Guided path

  Qualified person

  Separates a connection-point voltage the network operator owns from an inverter fault SMA Service owns.

  Step 1

  Establish whether the grid voltage at the inverter's connection point stays inside the permissible range.

  1. Check whether the grid voltage at the connection point of the inverter is permanently in the permissible range.

  What did you find?

  • It goes outside the permissible range because of local grid conditions
  • It stays permanently inside the permissible range and the event is still displayed

  Every step and fork on one page for 101 · 102 · 103 · 105

  Establish whether the grid voltage at the inverter's connection point stays inside the permissible range.

  1. Check whether the grid voltage at the connection point of the inverter is permanently in the permissible range.

  • It goes outside the permissible range because of local grid conditions — Contact the grid operator. The manual puts the next move with them: the operator has to agree either to an adjustment of the voltage at the feed-in point, or to a change of the monitored operating limits.
  • It stays permanently inside the permissible range and the event is still displayed — Contact SMA Service. The manual documents no further on-site step once the connection-point voltage is confirmed in range.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 202 · 203 · 205

  Grid disconnected / voltage too low

  The grid has been disconnected, the AC cable is damaged, or the grid voltage is too low.

  Show documented next stepHide detail for 202 · 203 · 205: Grid disconnected / voltage too low

  Documented next step

  Check the AC circuit breaker / main switch is on and the grid is present. If the grid is fine and it persists, have an installer inspect the AC cable and connections.

• 301

  10-minute average voltage out of range

  The ten-minute average grid voltage is outside the permissible range.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 301: 10-minute average voltage out of range

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  Monitor the grid voltage during operation. If it's persistently out of range due to local conditions, contact your network operator.

  Guided path

  Qualified person

  The same fork as events 101–105, but measured while the inverter is feeding in, because the trigger is a ten-minute average.

  Step 1

  Measure during feed-in, not at rest — the event trips on a ten-minute average.

  1. During the feed-in operation, check whether the grid voltage at the connection point of the inverter is permanently in the permissible range.

  What did you find?

  • It goes outside the permissible range because of local grid conditions
  • It stays permanently inside the permissible range and the event is still displayed

  Every step and fork on one page for 301

  Measure during feed-in, not at rest — the event trips on a ten-minute average.

  1. During the feed-in operation, check whether the grid voltage at the connection point of the inverter is permanently in the permissible range.

  • It goes outside the permissible range because of local grid conditions — Contact the grid operator. The manual requires their agreement either to an adjustment of the voltage at the feed-in point, or to a change of the monitored operating limits.
  • It stays permanently inside the permissible range and the event is still displayed — Contact SMA Service. The manual documents no further on-site step once the connection-point voltage is confirmed in range.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 302

  Power reduced: high AC voltage

  The inverter has reduced its output because the grid voltage is high (Volt-Watt response, to support grid stability).

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 302: Power reduced: high AC voltage

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  Expected behaviour when grid voltage is high, not a fault. If it happens often it's costing you generation. Your network voltage is high; contact your installer or network operator.

  Guided path

  Qualified person

  Volt-Watt derating: whether it is frequent enough to take to the network operator, and what the manual allows once they answer.

  Step 1

  Establish how often the grid voltage fluctuates and how often this event appears.

  1. If possible, check the grid voltage and observe how often fluctuations occur.

  What did you find?

  • Fluctuations occur frequently and this message is displayed often
  • Fluctuations are occasional and the message is rare

  Every step and fork on one page for 302

  Establish how often the grid voltage fluctuates and how often this event appears.

  1. If possible, check the grid voltage and observe how often fluctuations occur.

  • Fluctuations occur frequently and this message is displayed often — Establish whether the network operator will approve a change to the inverter's operating parameters.
  • Fluctuations are occasional and the message is rare — The manual attaches its next step to frequent fluctuations only and documents none for this case. What the event describes is the inverter reducing its power because grid voltage is too high, to keep the grid stable.

  Establish whether the network operator will approve a change to the inverter's operating parameters.

  1. Contact the grid operator and request approval to change the operating parameters of the inverter.

  • The grid operator gives approval — Discuss any changes to the operating parameters with SMA Service before making them.
  • The grid operator does not give approval — The manual makes the parameter change conditional on the operator's approval and documents no alternative, so its procedure ends here.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 401 · 404

  Islanding / frequency change

  A stand-alone (islanded) grid or a very large change in grid frequency was detected.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 401 · 404: Islanding / frequency change

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  Usually a short-term grid event that self-clears. If it recurs, have your installer check the grid connection for frequency fluctuations.

  Guided path

  Qualified person

  The two checks the manual sets after a stand-alone grid or a very large frequency change — the utility grid first, then the connection's short-term frequency.

  Step 1

  Rule out the utility grid itself before looking at the connection.

  1. Make sure there is no power outage or work being done on the utility grid and contact a grid operator if necessary.

  Checks done — next step

  Every step and fork on one page for 401 · 404

  Rule out the utility grid itself before looking at the connection.

  1. Make sure there is no power outage or work being done on the utility grid and contact a grid operator if necessary.

  Look at the grid connection for the condition the event names — a very large change in frequency.

  1. Check the grid connection for significant short-term frequency fluctuations.

  • The frequency check is done and the event still recurs — This entry's corrective measures end with the frequency check. It documents no next step for what that check finds, and names no service contact here.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 501

  Grid frequency out of range

  The power frequency is outside the permissible range.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 501: Grid frequency out of range

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  Monitor the frequency. If fluctuations are frequent, common on a backup generator, contact your network operator.

  Guided path

  Qualified person

  Grid frequency out of range: whether it is frequent enough to take to the network operator, and what the manual allows once they answer.

  Step 1

  Establish how often the grid frequency fluctuates and how often this event appears.

  1. If possible, check the grid frequency and observe how often fluctuations occur.

  What did you find?

  • Fluctuations occur frequently and this message is displayed often
  • Fluctuations are occasional and the message is rare

  Every step and fork on one page for 501

  Establish how often the grid frequency fluctuates and how often this event appears.

  1. If possible, check the grid frequency and observe how often fluctuations occur.

  • Fluctuations occur frequently and this message is displayed often — Establish whether the network operator will approve a change to the inverter's operating parameters.
  • Fluctuations are occasional and the message is rare — The manual attaches its next step to frequent fluctuations only and documents none for this case. What the event describes is the grid frequency falling outside the permissible range and the inverter disconnecting from the utility grid.

  Establish whether the network operator will approve a change to the inverter's operating parameters.

  1. Contact the grid operator and request approval to change the operating parameters of the inverter.

  • The grid operator gives approval — Discuss any changes to the operating parameters with SMA Service before making them.
  • The grid operator does not give approval — The manual makes the parameter change conditional on the operator's approval and documents no alternative, so its procedure ends here.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 601

  Excess DC in grid current

  The inverter detected an excessively high proportion of direct current in the grid current.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 601: Excess DC in grid current

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  A licensed installer should verify the event, grid-current condition and current country dataset against the STPxx-50 event manual. Do not raise a monitoring threshold without the required network approval; escalate a recurring event to SMA service.

  Guided path

  Qualified person

  Separates a one-off DC-in-grid-current trip from a recurring one, which is the only case this entry escalates.

  Step 1

  Check the connection for direct current, then settle whether this is a one-off or a pattern — the entry only escalates the pattern.

  1. Check the grid connection for direct current.

  What did you find?

  • The message is displayed frequently
  • It has appeared once, or only occasionally

  Every step and fork on one page for 601

  Check the connection for direct current, then settle whether this is a one-off or a pattern — the entry only escalates the pattern.

  1. Check the grid connection for direct current.

  • The message is displayed frequently — Contact the grid operator and check whether the monitoring threshold on the inverter can be raised.
  • It has appeared once, or only occasionally — This entry's corrective measures are the direct-current check above and, for a message displayed frequently, the grid operator. It documents no further step for an isolated occurrence.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 901

  Grounding (PE) connection missing

  The protective-earth (grounding) conductor is not correctly connected.

  Show documented next stepHide detail for 901: Grounding (PE) connection missing

  Documented next step

  An electrical-safety fault. Have a licensed electrician or installer check the earth connection against the installation manual. Don't keep resetting it.

• 1001

  Line and neutral swapped

  The L (active) and N (neutral) connections are swapped.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 1001: Line and neutral swapped

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.

  Installer remedy

  A wiring fault. Have your installer correct the L and N connections per the installation manual.

  Guided path

  Qualified person

  The two AC-connection checks the manual sets before a transposed active/neutral becomes an SMA Service call.

  Step 1

  Work the AC connection from the inverter outwards, then re-read the event.

  1. Check the AC wiring from the inverter to the feed-in meter.
  2. Check the AC voltages on the inverter connection.

  What did you find?

  • The message is still displayed after both checks

  Every step and fork on one page for 1001

  Work the AC connection from the inverter outwards, then re-read the event.

  1. Check the AC wiring from the inverter to the feed-in meter.
  2. Check the AC voltages on the inverter connection.

  • The message is still displayed after both checks — Contact SMA Service. The manual gives no third on-site check for this event.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 1302

  Waiting for grid voltage

  L or N is not connected (or an AC conductor is damaged), often simply a mains outage.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 1302: Waiting for grid voltage

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and time, check only whether the property has grid supply, and allow the inverter to recover. If it repeats, contact the installer; do not change the country dataset or protected grid parameters.

  Installer remedy

  If there's a power cut, it clears when supply returns. Otherwise check the AC main switch is on and the breaker hasn't tripped; if it persists, have an installer check the AC conductors.

  Guided path

  Qualified person

  The manual's full connection sequence, including its fork on the earthing system — a different neutral-to-earth limit for TN-C and for TT.

  Step 1

  Confirm supply actually reaches the inverter and that it is configured for this grid.

  1. Ensure that the miniature circuit breaker is switched on.
  2. Ensure that the correct country data set has been configured in the inverter.
  3. Ensure that the AC connection at the inverter and at the point of interconnection is correctly executed. Repair or replace defective terminal points and fuses.

  Checks done — next step

  Every step and fork on one page for 1302

  Confirm supply actually reaches the inverter and that it is configured for this grid.

  1. Ensure that the miniature circuit breaker is switched on.
  2. Ensure that the correct country data set has been configured in the inverter.
  3. Ensure that the AC connection at the inverter and at the point of interconnection is correctly executed. Repair or replace defective terminal points and fuses.

  Compare what the inverter sees with what the subdistribution sees.

  1. Ensure that the AC voltage at the AC connection of the inverter and in the subdistributor is in the permissible range. There should only be a few volts of difference between the values.
  2. For three-phase inverters, perform the measurements for all connection line conductors.

  Identify the earthing arrangement — the manual sets a different neutral-to-earth limit for each one it covers.

  1. Establish whether the inverter is connected to a TN-C system or a TT system.

  • TN-C system — Measure neutral against protective earth on a TN-C system.
  • TT system — Measure neutral against protective earth on a TT system.
  • Some other arrangement — The manual's neutral-to-earth limits do not reach this arrangement.

  Measure neutral against protective earth on a TN-C system.

  1. If the inverter is connected to a TN-C system, ensure that the voltage between N and PE is less than 0.3 V.

  Measure neutral against protective earth on a TT system.

  1. If the inverter is connected to a TT system, ensure that the voltage between N and PE is less than 10 V.

  The manual's neutral-to-earth limits do not reach this arrangement.

  1. This entry states a neutral-to-earth limit for a TN-C system and for a TT system, and gives no figure for any other arrangement.
  2. The measurements that follow are stated without reference to the earthing system, so continue with them.

  Check each line conductor against protective earth, then against neutral.

  1. Ensure that the voltage between the line conductor and protective conductor is the same as the mains voltage and in the permissible range. For three-phase inverters, perform the measurements for all connection line conductors.
  2. Ensure that the voltage between the line conductor and neutral conductor is the same as the mains voltage and in the permissible range. For three-phase inverters, perform the measurements for all connection line conductors.

  Close out on the installation's earthing.

  1. Ensure that all grounding measures are correctly executed.
  2. If necessary, check that the neutral point grounding of the system transformer is correct.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 1501

  Reconnection fault (country dataset)

  A changed country dataset or parameter value doesn't match local requirements.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 1501: Reconnection fault (country dataset)

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.

  Installer remedy

  The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.

  Guided path

  Qualified person

  The single configuration check the manual documents for a reconnection fault — no fork, because the entry has none.

  Step 1

  Check the configured country data set against what this connection requires.

  1. Ensure that the country data set has been configured correctly.
  2. To do this, select the parameter Set country standard and check the value.

  This is the end of the documented procedure for this code.

  Start a job with this code: SMA 1501

  On this device only. Signed in? Account Jobs still work.

  Every step and fork on one page for 1501

  Check the configured country data set against what this connection requires.

  1. Ensure that the country data set has been configured correctly.
  2. To do this, select the parameter Set country standard and check the value.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 3301 · 3302 · 3303

  Unstable operation (low DC)

  There isn't enough power at the DC input for stable operation.

  Show documented next stepHide detail for 3301 · 3302 · 3303: Unstable operation (low DC)

  Documented next step

  Often just low light, shading, or snow on the array. Check the panels are clear and the array is error-free; if it persists in good sun, contact your installer.

• 3401 · 3402 · 3407

  DC over-voltage

  Over-voltage at the DC input. This can destroy the inverter.

  Show documented next stepHide detail for 3401 · 3402 · 3407: DC over-voltage

  Documented next step

  Switch off the DC isolator and contact your installer immediately. The DC input voltage is above the inverter's maximum. The string is likely sized too long and must be corrected by a professional before reconnection.

• 3501

  Insulation failure (ground fault)

  A ground fault / low insulation resistance detected on the DC (PV) side, safety-critical, and common in wet weather.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 3501: Insulation failure (ground fault)

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.

  Installer remedy

  A licensed installer should follow the STPxx-50 event procedure to locate and rectify the PV insulation or residual-current cause under safe isolation. Clear the event only after the fault is corrected; do not transfer a Sunny Boy reset instruction to this Tripower X record.

  Guided path

  Qualified person

  The manual's insulation-failure sequence, with its two ground-fault tests — string-to-earth voltage, then insulation resistance — each of which stops the walk when it finds one.

  Step 1

  Establish how often the event occurs and when, because that sets the conditions every measurement below has to be taken under.

  1. Check the frequency and duration of the event message in the inverter's user interface or in the Sunny Portal.
  2. The measurements listed below should be performed under the same ambient conditions and at the same time of day as when the error occurred — ideally while an event message is active.

  Checks done — next step

  Every step and fork on one page for 3501

  Establish how often the event occurs and when, because that sets the conditions every measurement below has to be taken under.

  1. Check the frequency and duration of the event message in the inverter's user interface or in the Sunny Portal.
  2. The measurements listed below should be performed under the same ambient conditions and at the same time of day as when the error occurred — ideally while an event message is active.

  Establish whether module electronics sit between the array and the measurements.

  1. Establish whether module electronic components, such as SunSpec-compatible module disconnectors, are present.

  • Module electronic components are present — Keep the module electronics' signal up while you measure.
  • There are no module electronic components — Confirm the strings are reading the way the design says they should before drawing anything from a fault measurement.

  Keep the module electronics' signal up while you measure.

  1. If module electronic components, such as SunSpec-compatible module disconnectors, are present, an additional device is required to maintain the SunSpec PLC signal.

  Confirm the strings are reading the way the design says they should before drawing anything from a fault measurement.

  1. Verify through measurement of the open-circuit voltage of the PV strings that the measured values correspond to the system design and prevailing irradiation conditions.

  Measure each string against protective earth — the first of the entry's two ground-fault tests.

  1. Measure the voltage of each PV string between DC+ and PE, and between DC− and PE, using a suitable measuring device.

  • A stable voltage is measured that approximately equals the string voltage — This indicates a ground fault. Correct the ground fault on the relevant PV string and only then reconnect.
  • No stable voltage approximating the string voltage is measured — Measure insulation resistance — the entry's second ground-fault test.

  Measure insulation resistance — the entry's second ground-fault test.

  1. Measure the insulation resistance of each PV string using an insulation resistance meter.
  2. Ensure that the PV string is short-circuited during these measurements and that the maximum permissible system voltage of the PV modules is not exceeded.

  • The insulation resistance is too low — This indicates a ground fault. Correct the ground fault on the relevant PV string and only then reconnect.
  • The insulation resistance is not too low — Inspect the DC installation itself, which is where the entry's procedure ends.

  Inspect the DC installation itself, which is where the entry's procedure ends.

  1. Visually inspect the entire DC installation (PV modules, cables, plug connections, and any existing components such as module optimizers or disconnectors) to ensure there are no signs of damage, such as porosity, cracks, crushing, deformation, or discoloration.
  2. Tip: Use an IR camera for support.

  • A component shows signs of damage — Replace or repair any defective components.
  • The whole DC installation inspects clean and the event still occurs — This entry's corrective measures end at the visual inspection. For an insulation failure that survives every check above, it documents no further step — it names no reset procedure and no service contact here.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 3701

  Residual current too high

  The inverter detected an excessive residual (earth-leakage) current, an electric-shock hazard.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 3701: Residual current too high

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event, leave AC, PV and earthing wiring and isolators untouched, and contact the installer. Wiring and insulation checks require a licensed worker.

  Installer remedy

  A licensed installer should follow the STPxx-50 event procedure to locate and rectify the PV insulation or residual-current cause under safe isolation. Clear the event only after the fault is corrected; do not transfer a Sunny Boy reset instruction to this Tripower X record.

  Guided path

  Qualified person

  Works the AC side first — supply voltages, neutral-to-earth, module frame earthing — before joining the same DC measurement sequence event 3501 uses.

  Step 1

  Start on the AC side: this entry's first checks are at the inverter's AC connection and at the subdistribution.

  1. Ensure that the AC voltage between L and N, L and PE, and N and PE at the AC connection of the inverter and in the subdistributor is in the permissible range.
  2. For three-phase inverters, perform the measurements for all connection line conductors.

  Checks done — next step

  Every step and fork on one page for 3701

  Start on the AC side: this entry's first checks are at the inverter's AC connection and at the subdistribution.

  1. Ensure that the AC voltage between L and N, L and PE, and N and PE at the AC connection of the inverter and in the subdistributor is in the permissible range.
  2. For three-phase inverters, perform the measurements for all connection line conductors.

  Measure neutral against protective earth.

  1. Using a suitable measuring device, ensure that the voltage between N and PE is less than 10 V.

  Close out the AC-side earthing before moving to the array.

  1. Ensure that the module frame is correctly grounded.

  Move to the DC side. From here the entry runs the same measurement sequence as event 3501.

  1. Check the PV system for ground faults.

  Establish how often the event occurs and when, because that sets the conditions every measurement below has to be taken under.

  1. Check the frequency and duration of the event message in the inverter's user interface or in the Sunny Portal.
  2. The measurements listed below should be performed under the same ambient conditions and at the same time of day as when the error occurred — ideally while an event message is active.

  Establish whether module electronics sit between the array and the measurements.

  1. Establish whether module electronic components, such as SunSpec-compatible module disconnectors, are present.

  • Module electronic components are present — Keep the module electronics' signal up while you measure.
  • There are no module electronic components — Confirm the strings are reading the way the design says they should before drawing anything from a fault measurement.

  Keep the module electronics' signal up while you measure.

  1. If module electronic components, such as SunSpec-compatible module disconnectors, are present, an additional device is required to maintain the SunSpec PLC signal.

  Confirm the strings are reading the way the design says they should before drawing anything from a fault measurement.

  1. Verify through measurement of the open-circuit voltage of the PV strings that the measured values correspond to the system design and prevailing irradiation conditions.

  Measure each string against protective earth — the first of the entry's two ground-fault tests.

  1. Measure the voltage of each PV string between DC+ and PE, and between DC− and PE, using a suitable measuring device.

  • A stable voltage is measured that approximately equals the string voltage — This indicates a ground fault. Correct the ground fault on the relevant PV string and only then reconnect.
  • No stable voltage approximating the string voltage is measured — Measure insulation resistance — the entry's second ground-fault test.

  Measure insulation resistance — the entry's second ground-fault test.

  1. Measure the insulation resistance of each PV string using an insulation resistance meter.
  2. Ensure that the PV string is short-circuited during these measurements and that the maximum permissible system voltage of the PV modules is not exceeded.

  • The insulation resistance is too low — This indicates a ground fault. Correct the ground fault on the relevant PV string and only then reconnect.
  • The insulation resistance is not too low — Inspect the DC installation itself, which is where the entry's procedure ends.

  Inspect the DC installation itself, which is where the entry's procedure ends.

  1. Visually inspect the entire DC installation (PV modules, cables, plug connections, and any existing components such as module optimizers or disconnectors) to ensure there are no signs of damage, such as porosity, cracks, crushing, deformation, or discoloration.
  2. Tip: Use an IR camera for support.

  • A component shows signs of damage — Replace or repair any defective components.
  • The whole DC installation inspects clean and the event still occurs — This entry's corrective measures end at the visual inspection. For a residual current that survives every AC-side and DC-side check above, it documents no further step — it names no reset procedure and no service contact here.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 3801 · 3802 · 3805

  DC over-current

  Over-current at the DC input; the inverter briefly interrupts feed-in.

  Show documented next stepHide detail for 3801 · 3802 · 3805: DC over-current

  Documented next step

  If it's frequent, have your installer verify the PV array is correctly rated and wired (and check for a short circuit).

• 3901 · 3902

  Waiting for DC start conditions

  The conditions for feeding into the grid aren't yet met, typically insufficient irradiation.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 3901 · 3902: Waiting for DC start conditions

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Note the time and check only for safely visible shading or low light. If the event remains in good daylight, contact the installer; do not operate isolators.

  Installer remedy

  Normal early/late in the day. Make sure the array isn't covered or shaded; if it persists in good sun, contact your installer.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 6501 · 6502 · 6509

  Over-temperature

  The inverter has switched off (or derated) due to excessive temperature.

  Show documented next stepHide detail for 6501 · 6502 · 6509: Over-temperature

  Documented next step

  Clear dust from the cooling fins and air ducts, ensure good ventilation, and keep the ambient temperature within limits (and the unit out of direct sun). If it persists, contact your installer.

• 6512

  Minimum operating temperature not reached

  It's too cold. The inverter only resumes feed-in once the temperature reaches at least −25 °C.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 6512: Minimum operating temperature not reached

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  No action is normally required. Record the event and allow the inverter to resume when its operating temperature is reached.

  Installer remedy

  No action needed; it resumes automatically as the temperature rises.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 7500 · 7501

  Fan fault

  A cooling fan is not functioning properly.

  Show documented next stepHide detail for 7500 · 7501: Fan fault

  Documented next step

  Check the fan area for blockage. If the fan is faulty it needs service. Contact your installer or SMA Service.

• 7701 · 7702 · 7703

  Grid relay defect

  The grid disconnection relay is defective or failed its test.

  Show documented next stepHide detail for 7701 · 7702 · 7703: Grid relay defect

  Documented next step

  A hardware fault. Contact SMA Service or your installer. If shown only occasionally, note whether it recurs.

• 8003

  Power reduced: temperature

  The inverter has reduced output for more than ten minutes because of excessive temperature.

  Show documented next stepHide detail for 8003: Power reduced: temperature

  Documented next step

  Clean the cooling fins and air ducts, ensure adequate ventilation, and keep the ambient temperature within the rated limit. If it recurs, contact your installer.

• 9002

  Grid Guard code invalid

  The SMA Grid Guard code entered is incorrect, so the protected operating parameters stay locked.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 9002: Grid Guard code invalid

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.

  Installer remedy

  The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 9003

  Grid parameters locked

  Changes to the grid parameters are now blocked (they require the Grid Guard code).

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 9003: Grid parameters locked

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.

  Installer remedy

  The responsible installer should verify the Australian country dataset and protected parameter state against the STPxx-50 manual. Use authorised credentials only for an approved change; do not alter grid settings merely to clear the event.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff
• 9007

  Self-test aborted

  The inverter's self-test was terminated.

  Product fit · Confirmed · Sunny Tripower X 12/15/20/25

  Show field stepsHide field steps for 9007: Self-test aborted

  Product fit

  • Sunny Tripower X 12/15/20/25 · Three-phase string inverter

    Confirmed · STP12-50–STP25-50 · Firmware 2.06.04.R or later

  Safe checks now

  Record the event and leave protected settings and self-test controls to the responsible installer. Contact the installer if the event blocks operation or repeats.

  Installer remedy

  A licensed installer should verify the AC connection and repeat the self-test only through the STPxx-50 documented procedure. Preserve the result and escalate repeated aborts to SMA service rather than changing protected settings.

  Remedy sourceSunny Tripower X events

  Manufacturer / escalation handoff