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SMA error codes explained

What 64 SMA inverter fault and error codes mean, in plain English, with safe checks you can do and when to call a licensed electrician.

Guide only. This information is a general guide taken from manufacturer documentation. All electrical work must be performed by a licensed electrician. Never open your inverter, battery or switchboard. If you see smoke, smell burning or see damage, keep clear and call 000.
CodeMessage & meaningModelType
101Warning
Grid incident

The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
102Warning
Grid incident

The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
103Warning
Grid incident

The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
104Warning
Grid incident

The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
105Warning
Grid incident

The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
202Warning
Grid incident

The utility grid has been disconnected, the AC cable is damaged or the grid voltage at the connection point of the inverter is too low. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
203Warning
Grid incident

The utility grid has been disconnected, the AC cable is damaged or the grid voltage at the connection point of the inverter is too low. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
205Warning
Grid incident

The utility grid has been disconnected, the AC cable is damaged or the grid voltage at the connection point of the inverter is too low. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
206Warning
Grid incident

The utility grid has been disconnected, the AC cable is damaged or the grid voltage at the connection point of the inverter is too low. The inverter has disconnected from the utility grid. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
301Warning
Grid incident

The ten-minute average value of the grid voltage is no longer within the permissible range. The grid voltage or grid impedance at the connection point is too high. The inverter disconnects from the utility grid to maintain power quality.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
302Warning
Active power limited AC voltage

The inverter has reduced its power due to a too-high grid voltage to ensure grid stability.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
401Warning
Grid incident

The inverter has disconnected from the utility grid. A stand-alone grid or a very large change in the grid frequency was detected.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
404Warning
Grid incident

The inverter has disconnected from the utility grid. A stand-alone grid or a very large change in the grid frequency was detected.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
501Warning
Grid incident

The grid frequency is not within the permissible range. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
502Warning
Grid incident

The grid frequency is not within the permissible range. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
503Warning
Grid incident

The grid frequency is not within the permissible range. The inverter has disconnected from the utility grid.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
507Warning
Active power limit AC frequency

The inverter has reduced its power due to a too-high grid frequency to ensure grid stability.

What you can do

  • This is caused by the mains frequency moving outside the allowed range, usually briefly
  • The inverter reconnects by itself once the grid is stable
  • If it keeps happening, note the times and call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
601Warning
Grid incident

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

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
701Warning
Frequency not permitted • Check parameter

The grid frequency is not within the permissible range. The inverter has disconnected from the utility grid.

What you can do

  • This is caused by the mains frequency moving outside the allowed range, usually briefly
  • The inverter reconnects by itself once the grid is stable
  • If it keeps happening, note the times and call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
901Safety-Critical
PE connection missing • Check connection

The grounding conductor is not correctly connected.

What you can do

  • Do not touch the panels, rooftop isolators or DC cables
  • Note the code and whether it appears in wet weather or early morning - this helps the electrician
  • If it clears by itself once things dry out, still let us know if it keeps returning
  • Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
1001Fault
L / N swapped

Incorrect installation of the L / N connection.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
1101Fault
Installation error • Check connection

A second line conductor is connected to N.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
1302Warning
Waiting for grid voltage • Grid connection installation failure • Check grid and fuses

L or N not connected.

What you can do

  • This is usually caused by the mains supply, not the solar system
  • The inverter normally reconnects by itself once grid voltage is back in range
  • If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
1501Warning
Reconnection fault grid

The changed country standard or the value of a parameter you have set does not correspond to the local requirements. The inverter cannot connect to the utility grid.

What you can do

  • Check the monitoring app for the alarm and whether export/consumption readings look wrong
  • Restart your home router if the meter talks over Wi-Fi or LAN
  • Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3302Fault
Unstable operation

There is not enough power at the DC input of the inverter for stable operation. The inverter cannot connect to the utility grid. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • Check solar generation in the app compared with similar days
  • Do not touch the DC isolators, cables or connectors, and don't go on the roof
  • If it doesn't clear by itself, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3303Fault
Unstable operation

There is not enough power at the DC input of the inverter for stable operation. The inverter cannot connect to the utility grid.

What you can do

  • Check solar generation in the app compared with similar days
  • Do not touch the DC isolators, cables or connectors, and don't go on the roof
  • If it doesn't clear by itself, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3501Safety-Critical
Insulation failure • Check generator

The inverter has detected a ground fault in the PV module.

What you can do

  • Do not touch the panels, rooftop isolators or DC cables
  • Note the code and whether it appears in wet weather or early morning - this helps the electrician
  • If it clears by itself once things dry out, still let us know if it keeps returning
  • Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3601Safety-Critical
High discharge current • Check generator

The leakage current of the inverter and the PV module is too high. There is a ground fault, a residual current or a malfunction. The inverter interrupts feed-in operation immediately after exceeding a threshold. When the fault is eliminated, the inverter automatically reconnects to the utility grid.

What you can do

  • Do not touch the panels, rooftop isolators or DC cables
  • Note the code and whether it appears in wet weather or early morning - this helps the electrician
  • If it clears by itself once things dry out, still let us know if it keeps returning
  • Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3701Safety-Critical
Residual current too high • Check generator

The inverter has detected a residual current through brief grounding of the PV module.

What you can do

  • Do not touch the panels, rooftop isolators or DC cables
  • Note the code and whether it appears in wet weather or early morning - this helps the electrician
  • If it clears by itself once things dry out, still let us know if it keeps returning
  • Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3801Safety-Critical
Residual current too high • Check generator

Overcurrent at the DC input. The inverter briefly interrupts feed-in operation.

What you can do

  • Keep clear and do not touch the inverter or cabling
  • Note the code, date and time
  • Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3802Safety-Critical
Residual current too high • Check generator

Overcurrent at the DC input. The inverter briefly interrupts feed-in operation. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • Keep clear and do not touch the inverter or cabling
  • Note the code, date and time
  • Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3805Safety-Critical
Residual current too high • Check generator

Overcurrent at the DC input. The inverter briefly interrupts feed-in operation.

What you can do

  • Keep clear and do not touch the inverter or cabling
  • Note the code, date and time
  • Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3901Fault
Waiting for DC start conditions • Start conditions not met

The feed-in conditions for the utility grid are not yet fulfilled.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3902Fault
Waiting for DC start conditions • Start conditions not met

The feed-in conditions for the utility grid are not yet fulfilled.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
3908Safety-Critical
Leakage current-carrying capacity of DC generator too high.

The permissible residual current reaches or exceeds the threshold.

What you can do

  • Keep clear and do not touch the inverter or cabling
  • Note the code, date and time
  • Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
4011Fault
Bridged strings determined

The DC inputs A and B are connected in parallel.

What you can do

  • Check solar generation in the app compared with similar days
  • Do not touch the DC isolators, cables or connectors, and don't go on the roof
  • If it doesn't clear by itself, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
4012Fault
No bridged strings determined

The DC inputs A and B are not connected in parallel. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • Check solar generation in the app compared with similar days
  • Do not touch the DC isolators, cables or connectors, and don't go on the roof
  • If it doesn't clear by itself, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
4301Safety-Critical
Serial el.arc in String |s0| detected by AFCI mod.

The inverter has detected an electric arc in the displayed string. If "String N/A" is displayed, the string could not be uniquely assigned.

What you can do

  • Keep clear of the inverter, panels and DC cables, and do not touch any isolators
  • Note the code, date and time, and check whether the alarm is still showing in the app
  • If you smell burning or see smoke, get everyone out and call 000
  • Call a licensed electrician or Total Solar - an arc fault means a DC wiring or connector problem that must be inspected

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6001-6499Fault
Self-diagnosis • Interference device

The cause must be determined by the Service.

What you can do

  • Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
  • If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6501Warning
Self-diagnosis • Overtemperature

The inverter has switched off due to excessive temperature.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6502Warning
Self-diagnosis • Overtemperature

The inverter has switched off due to excessive temperature.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6509Warning
Self-diagnosis • Overtemperature

The inverter has switched off due to excessive temperature.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6512Warning
Minimum operating temperature not reached

The inverter will only recommence grid feed-in once the temperature has reached at least −25°C.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6603Fault
Self-diagnosis • Overcurrent grid (HW)

The cause must be determined by the Service.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6604Fault
Self-diagnosis • Overvoltage intermediate circuit (SW)

The cause must be determined by the Service.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6801Fault
Self-diagnosis • Input A defective

Polarity error on the inverter.

What you can do

  • Do not touch the DC isolators, cables or connectors
  • Call your installer - this points to a wiring problem that needs a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6802Fault
Self-diagnosis • Input A defective

Polarity error on the inverter.

What you can do

  • Do not touch the DC isolators, cables or connectors
  • Call your installer - this points to a wiring problem that needs a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6901Fault
Self-diagnosis • Input B defective

Polarity error on the inverter.

What you can do

  • Do not touch the DC isolators, cables or connectors
  • Call your installer - this points to a wiring problem that needs a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
6902Fault
Self-diagnosis • Input B defective

Polarity error on the inverter. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • Do not touch the DC isolators, cables or connectors
  • Call your installer - this points to a wiring problem that needs a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
7001Warning
Fault sensor interior temperature

A temperature sensor in the inverter is defective and the inverter interrupts the feed-in operation. The cause must be determined by the Service.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
7002Warning
Fault sensor interior temperature

A temperature sensor in the inverter is defective and the inverter interrupts the feed-in operation. The cause must be determined by the Service.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
7701Fault
Self-diagnosis • Interference device

The cause must be determined by the Service.

What you can do

  • Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
  • If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
7702Fault
Self-diagnosis • Interference device

The cause must be determined by the Service.

What you can do

  • Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
  • If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
7703Fault
Self-diagnosis • Interference device

The cause must be determined by the Service.

What you can do

  • Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
  • If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
8003Warning
Temperature derating

The inverter has reduced its power output for more than 10 minutes due to excessive temperature.

What you can do

  • Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
  • It usually recovers once it cools down
  • If it repeats often or you can hear a noisy/failed fan, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
8204Safety-Critical
AFCI self-test failed

An error occurred during the self-test of SMA ArcFix. It is not guaranteed that SMA ArcFix will function correctly. The device does not feed in.

What you can do

  • Keep clear of the inverter, panels and DC cables, and do not touch any isolators
  • Note the code, date and time, and check whether the alarm is still showing in the app
  • If you smell burning or see smoke, get everyone out and call 000
  • Call a licensed electrician or Total Solar - an arc fault means a DC wiring or connector problem that must be inspected

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
8205Safety-Critical
AFCI self-test successful

The self-test of SMA ArcFix has been completed successfully.

What you can do

  • Keep clear of the inverter, panels and DC cables, and do not touch any isolators
  • Note the code, date and time, and check whether the alarm is still showing in the app
  • If you smell burning or see smoke, get everyone out and call 000
  • Call a licensed electrician or Total Solar - an arc fault means a DC wiring or connector problem that must be inspected

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
8708Warning
Timeout in communication for active power limitation

Communication to the system control absent. Depending on the fallback setting, either the last received values will be retained or the active power will be limited to the set percentage value of the inverter nominal power.

What you can do

  • Check that your home Wi-Fi/internet is working and restart your router
  • Wait an hour - monitoring often reconnects by itself
  • If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
8709Warning
Timeout in communication for reactive power spec.

Communication to the system control absent.

What you can do

  • Check that your home Wi-Fi/internet is working and restart your router
  • Wait an hour - monitoring often reconnects by itself
  • If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
9002Warning
Installer code invalid

The SMA Grid Guard code entered is incorrect. The operating parameters are still protected and cannot be changed.

What you can do

  • Check the monitoring app for the alarm and whether export/consumption readings look wrong
  • Restart your home router if the meter talks over Wi-Fi or LAN
  • Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
9003Warning
Grid parameter locked

Changes to the grid parameters are now blocked. In order to be able to make changes to the grid parameters, from now on you must log in using the SMA Grid Guard code. 11 Troubleshooting SMA Solar Technology AG

What you can do

  • Check the monitoring app for the alarm and whether export/consumption readings look wrong
  • Restart your home router if the meter talks over Wi-Fi or LAN
  • Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
9007Fault
Abort self-test

The self-test was terminated.

What you can do

  • Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
  • If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
10431Fault
I-V curve measurement was successful

This message is issued at the end of a measurement.

What you can do

  • Note the code, date and time and check the monitoring app
  • Restart the system once using the owner shutdown/start-up steps in your manual if it allows
  • If it comes back, call your installer

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter
29001Warning
SMA Grid Guard code valid

The entered SMA Grid Guard code is valid. The parameters protected with the SMA Grid Guard code can now be set.

What you can do

  • Check the monitoring app for the alarm and whether export/consumption readings look wrong
  • Restart your home router if the meter talks over Wi-Fi or LAN
  • Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) · Guide only. All work must be done by a licensed electrician.

Sunny Boy 3.0/3.6/4.0/5.0/6.0 (SBxx-1AV-41) Inverter

Common SMA questions

What does SMA 1001 "L / N swapped" mean?

Incorrect installation of the L / N connection. Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does SMA 1101 "Installation error • Check connection" mean?

A second line conductor is connected to N. Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

What does SMA 3302 "Unstable operation" mean?

There is not enough power at the DC input of the inverter for stable operation. The inverter cannot connect to the utility grid. 11 Troubleshooting SMA Solar Technology AG Check solar generation in the app compared with similar days This is a guide only; any electrical work must be done by a licensed electrician.

What does SMA 3303 "Unstable operation" mean?

There is not enough power at the DC input of the inverter for stable operation. The inverter cannot connect to the utility grid. Check solar generation in the app compared with similar days This is a guide only; any electrical work must be done by a licensed electrician.

What does SMA 3901 "Waiting for DC start conditions • Start conditions not met" mean?

The feed-in conditions for the utility grid are not yet fulfilled. Note the code, date and time and check the monitoring app This is a guide only; any electrical work must be done by a licensed electrician.

Need help with this fault?

Get a licensed electrician to call you back.

Total Solar can help: our licensed electricians install and service systems. Based in Ellenbrook, WA, with Victoria and Queensland also available.

Or call 1300 209 503

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Sources

Meanings are summarised from these manufacturer documents. Check your own model's manual, as codes vary between models and firmware versions.

SMA is a trademark of its owner. Total Solar is not affiliated with the manufacturer unless stated. All fault code guides

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Government incentives are subject to eligibility, availability and change. Amounts are shown as "up to" figures and were checked on 12 October 2026. Always confirm details on the official program website. Total Solar is not a government body and isn't affiliated with or endorsed by any government program. Results from solar and battery systems vary with usage, tariffs, weather and system design. Fault code information is a general guide only. All work on solar panels, inverters and batteries must be performed by a licensed electrician. Brand names are trademarks of their respective owners.

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