SMA SunnyBoy Inverter Faults and Repairs

Event 1 – Grid Fault: The inverter has identified the grid (mains) voltage or a grid impedance to be too high in relation to the parameters that the
inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.

Event 2 – Grid Fault: The inverter has identified the grid (mains) voltage or a grid impedance to be too low in relation to the parameters that the
inverter has been set to safely operate within. If this fault persists and mains power is available to other local circuits then check that all isolators,
MCBs and RCBs on the AC side of the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Off’ then
leave them ‘Off’ and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the
grid.

Event 3 – Grid Fault: The inverter has identified a 10 minute average grid (mains) voltage or a grid impedance that is too high in relation to the
parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish
whether the fault lies with the inverter or with the grid.

Event 4 – Grid Fault: The inverter is no longer able to work in grid parallel operation mode due to frequent fluctuations or an unstable grid
(mains) connection and has stopped feed‑in operation for safety reasons. If this fault persists contact us to arrange for an engineer to visit to
establish whether the fault lies with the inverter or with the grid.

Event 5 – Grid Fault: The inverter has identified a grid (mains) frequency that is either too high or too low in relation to the parameters that the
inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.

Event 6 – Grid Fault: The internal monitoring function of the inverter has identified an excessively high proportion of direct current in the
grid current. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.

Event 7 – Frequency not permitted: The inverter has identified a power frequency outside the permissible range that the inverter has been set
to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with
the grid.

Event 8 – Waiting for grid voltage – Grid Failure – Check Fuse: The inverter has identified that there has been a mains failure (a power cut). If this
fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of the solar PV
system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Off’ then leave them ‘Off’ and contact us to arrange for an
engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.

Event 9 – PE conn. missing – Check connection: The inverter has identified that the protective earth connection is missing from the AC
supply side. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCBs on the AC side of
the solar PV system are ‘On’. If automatic safety devices such as MCBs or RCBs have switched ‘Off’ then leave them ‘Off’ and contact us
to arrange for an engineer to visit to establish whether the fault lies with the inverter or the supply circuit.

Event 10 – L / N swapped – Check connection: The inverter has identified that the Live and Neutral connectors are swapped on the AC supply
side. This fault is unlikely to occur in an existing installation that has previously worked correctly. If this fault persists contact us to arrange for an
engineer to visit to establish whether the fault lies with the inverter or the supply circuit.

Event 11 – Installation fault – Check connection: The inverter has identified that either the Live and Neutral connectors are swapped on the AC
supply side or the second phase has been connected to the Neutral on a three phase circuit. This fault is unlikely to occur in an existing installation
that has previously worked correctly. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the
inverter or the supply circuit.

Event 33 – Unstable operation : The inverter has identified low DC voltage. Assuming that there is adequate sunlight, this is an existing installation
that has been installed correctly, no changes were made near the installation area and the system has operated before without problems, if this error
persists then we would advise that the DC side of the system including and excluding the inverter is tested.

Event 34 – DC overvoltage – Disconnect generator: The inverter has identified higher voltage from the panels. Assuming that this is an existing
installation that has been installed correctly, has recently not been changed or upgraded and has operated before without problems. This could
mean either a problem with the panels or with the inverter. We would advise to disconnect the DC side of the system using either the built in DC
isolator at the bottom of the inverter or the DC Isolator installed between the panels and the inverter (if available) and contact us to test the DC
side of the system including and excluding the inverter.

Event 35 – Insulation resist – Check generator: The inverter has identified a fault during normal operations, maybe a leakage current to ground/
earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining
or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by
themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system
test, identify the source and rectify the fault.

Event 36 – High discharge curr. – Check generator: This error is generated when during normal operation of the inverter, a leakage current to
ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is
raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not
get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.

Event 37 – Resid.curr.too.high – Check generator: This error is generated when during normal operation of the inverter, a leakage current
to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not
get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.

Event 38 – DC overcurrent – Check generator: The inverter has identified too much current from the panels. Assuming that this is an existing
installation that has been installed correctly, has recently not been changed or upgraded and has operated before without problems. This could
mean either a problem with the panels or with the inverter. We would advise to disconnect the DC side of the system using either the built in DC
isolator at the bottom of the inverter or the DC Isolator installed between the panels and the inverter (if available) and contact us to test the DC
side of the system including and excluding the inverter.

Event 39 – Waiting for DC start conditions – Start cond. not met: The inverter has identified low DC voltage. Assuming that there is adequate
sunlight, this is an existing installation that has been specified correctly, no changes near the installation area have been carried out and the system has operated before without problems, then if this fault persists, we would advise that the DC side of the system including and excluding the inverter is tested.

Event 60 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 61 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 62 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 63 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 64 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 65 – Self diagnosis – Over-temperature: The ambient temperature around the inverter is too hot. This could be due to a number of factors,
for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without adequate ventilation around the chassis which  would allow excess heat to dissipate 3) The inverters components are getting too hot due to an internal component fault. If the unit isn’t running hot  and if after the system has been safely shutdown and restarted this condition persists then contact us.

Event 66 – Self diagnosis – Overload: This is an internal error, indicating a fault within the inverter. If after the system has been safely shutdown and
restarted this condition persists please contact us.

Event 67 – Comm. disturbed: This is an internal error, indicating a fault within the inverter. If after the system has been safely shutdown and
restarted this condition persists please contact us.

Event 68 – Self diagnosis – Input A defective: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 69 – Self diagnosis – Input B defective: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 70 – Sensor fault fan permanently on: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 71 – Various messages: There are various messages that can be present alongside an Event 71 fault code. These are mostly related to the
SD card and firmware. Contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be
resolved.

Event 72 – Data stor. not poss.: This is an internal error, indicating a fault within the inverter. If after the system has been safely shutdown and
restarted this condition persists please contact us.

Event 73 – Various messages: There are various messages that can be present alongside an Event 73 fault code. These are mostly related to
internal components that are showing errors but the errors aren’t serious enough to prevent grid feed in. Contact us with the exact message
as displayed on the screen to discuss what these issues might be and how they can be resolved.

Event 74 – Varistor defective: This is an internal error, indicating a fault within the inverter. If after the system has been safely shutdown and
restarted this condition persists please contact us.

Event 75 – Fan fault – Clean fan: The temperature inside the inverter is too hot which the inverter understands is due to dust, fluff or a
similar obstruction blocking the vents or fans inside the chassis. If after the system has been safely shutdown and restarted this condition persists
then contactus.

Event 77 – Self diagnosis – Interference device: This is an internal error, indicating a fault within the inverter. If after the system has been safely
shutdown and restarted this condition persists please contact us.

Event 80 – Derating occurred: The inverter has diagnosed a high temperature for more than 10 minutes and has reduced power output to protect
itself. This could be due to a number of factors, for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without
adequate ventilation around the chassis which would allow excess heat to dissipate 3) The inverters components are getting too hot due to
an internal component fault. If the unit isn’t running hot and if after the system has been safely shutdown and restarted this condition persists
then contactus.

Event 81 – Comm. disturbed: This is an internal error, indicating a fault within the inverter. If after the system has been safely shutdown and
restarted this condition persists please contact us.

Event 90 – Various messages: There are various messages that can be present alongside an Event 90 fault code. These are mostly related to
the initial setup at installation so should not be present on an existing system. If after the system has been safely shutdown and restarted
this condition persists then contact us us with the exact message as displayed on the screen to discuss what these issues might be and how
they can be resolved.

We are familiar and comfortable working with these units, please let us know if there is anything that we can help you with in regards to
error codes and faults, repairs, advising on replacements and if you have any performance or safety concerns.