The Complete Guide To ABB Aurora Inverter Error Codes

The two circuits that each measure the grid voltage no longer agree, which is a fault inside the inverter rather than a problem with the grid.

The two circuits that each measure the grid frequency no longer agree, which is a fault inside the inverter rather than a problem with the grid.

The grid voltage at your house, averaged over ten minutes, is above the allowed limit, so the inverter has disconnected. It will reconnect by itself. If it happens most sunny afternoons the network voltage is high or the cable run is too long.

The voltage or frequency coming from the street is outside the limits the inverter is allowed to feed into, so it has disconnected and will retry by itself. If it happens every afternoon the grid voltage at your house is running high. This is warning W003.

The inverter cannot see any mains voltage on its AC side, so it is waiting. It is normal during a blackout; otherwise the solar supply main switch or breaker at the switchboard has tripped or been turned off.

The inverter has lost or never had its country grid standard setting, so it will not connect. It needs the Australian standard set again by someone with the service software.

The grid voltage or frequency moved outside the allowed limits, or the mains dropped out, so the inverter disconnected and will retry by itself. Every afternoon means high grid voltage at your house.

The grid voltage went above the limit while the inverter was running, so it disconnected. It reconnects by itself; if it is a daily event the network voltage is high.

The grid voltage dropped below the limit, so the inverter disconnected. It reconnects by itself once the supply recovers.

The grid frequency went above the limit, so the inverter disconnected. It is a network event and the inverter reconnects by itself.

The grid frequency dropped below the limit, so the inverter disconnected. It is a network event and the inverter reconnects by itself.

The inverter thinks it is feeding a section of grid that has been cut off from the network, so it has disconnected as it must. It reconnects by itself once the grid looks normal; a repeat with the grid healthy needs a check.

A surge arrester on the DC side has done its job and is now spent, usually after a lightning storm. The unit may keep running but the surge protection is gone until the cartridge is replaced.

A surge arrester on the AC side has done its job and is now spent, usually after a lightning storm. The surge protection is gone until the cartridge is replaced.

The inverter tried to connect to the grid and could not, usually because the mains dropped out or the panel voltage fell during the connection sequence. It keeps trying by itself.

The voltage from the panels is above the inverter operating range, so it will not start. Cold clear mornings push panel voltage up; if the array was always close to the limit this will keep happening, otherwise the inverter is mis-reading.

One of the power switching devices inside the inverter hit its limit. A one-off can come from a sudden grid or panel voltage change and the inverter recovers by itself; if it keeps appearing the power stage is failing. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The DC converter stage inside the inverter took too long to come up to speed. It is an internal fault that cannot be checked from outside.

The booster (DC to DC) stage inside the inverter has failed. It cannot be checked from outside and on this range it is usually the end of the unit.

On three-phase units, the output across the three phases is out of balance. It is a measurement fault inside the inverter.

The power switching circuit inside the inverter is not ready. It is an internal fault.

The inverter has been turned off by its remote on/off input and is waiting to be turned back on. If nothing is wired to that input, a full power cycle usually clears it; otherwise the remote function needs to be disabled.

The panels are not making enough voltage for the inverter to start, which is normal early, late and on dark days. If it stays on the screen in good sun the array or the inverter input needs checking. This is warning W001.

The panel voltage is below the start level when the inverter tries to switch on. Normal at dawn, dusk and in heavy cloud; a problem only if it stays in good sun.

The panel voltage dropped below the minimum while the inverter was running, so it has switched off. Normal in the evening or under fast cloud; a problem only if it happens in good sun.

On units with monitored string fuses, one or more fuses in the wiring box has blown or the string setting is wrong. A blown fuse means a string is not producing.

While running, the inverter detected current leaking to earth from the panels or DC cabling and disconnected, with the red GFI light on. UNO-DM units call this Leak Fault and it resets itself, but it will keep tripping until the leak is found. Water in a connector or isolator is the usual cause.

Before connecting, the inverter tests its own earth-leakage sensor and the test failed. It is a fault inside the unit, not the panels.

The morning insulation test of the panels and DC cabling to earth read below 1 megohm, so the inverter will not connect. FIMER confirms E025 is the Riso Low alarm and that it clears itself once the insulation dries out, which is why it shows on damp mornings and goes by lunch. Water in a connector, isolator or junction box, or a damaged panel or cable, is the usual cause.

The two circuits that each measure earth leakage no longer agree. It is a fault inside the inverter, not a leak in the panels.

Only on units fitted with a grounding kit for thin-film panels: the voltage across the earthing resistor is too high, which means an insulation problem on the array.

The inverter detected electrical arcing on the DC cables and has locked itself off. Arcing means a loose or damaged connection that can start a fire, so leave the system off and have it checked before it is reset.

The arc-fault detection board failed its own self-test. The inverter will try again after a power cycle; if it keeps failing the board is faulty.

The inverter has found current leaking to earth from the panels or DC cabling and has shut down, with the red GFI light on. It is usually water in a roof isolator, a connector or a damaged cable, and it is live DC, so leave it to an electrician.

Before connecting each morning the inverter measures the insulation of the panels and DC cabling to earth, and it is below 1 megohm, so it refuses to connect. The usual causes are moisture in a connector, a damaged panel or cable, or a wet junction box. On UNO-DM units this is error E025.

The inverter is too hot (over 60 degrees inside) and has cut back or stopped until it cools. Afternoon sun on the unit or a blocked heatsink is the usual cause; if it happens on mild days the temperature sensing or fan is faulty. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The inverter thinks it is below minus 25 degrees. In Australia that is almost always a faulty temperature sensor rather than the weather. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The temperature measured in the inverter wiring box or external box is too high. The unit stops until it cools; direct sun on the box or blocked airflow is the usual cause, and if it happens on mild days the sensor is faulty. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

A cooling fan inside the inverter has stopped working, shown by a flashing yellow light. The inverter keeps running but will cut its output on hot days until the fan is fixed. This is warning W010. A fan fault lets the inverter overheat, so we treat it as a call.

A cooling fan inside the inverter has failed, shown by a flashing yellow light rather than a message. The inverter keeps running but cuts its output on hot days. A fan fault lets the inverter overheat, so we treat it as a call.

The current coming in from the panels is above what the inverter allows. On a system that has run for years without this, it points to a fault in the inverter input rather than the panels.

The main controller could not start the two internal processors, which is a fault on the internal bus of the inverter. It cannot be checked from outside.

The voltage on the inverter internal capacitors went above its limit. A spike from the grid or a very high panel voltage can cause a one-off, and the unit restarts itself; if it keeps coming back the fault is internal.

The control boards inside the inverter have stopped talking to each other. It is not the monitoring or wifi; it is a fault inside the unit.

The current the inverter is pushing into the grid went above its limit. This is a fault in the inverter output stage and cannot be checked from outside.

A fault inside the inverter that cannot be checked from outside. If it is still there after a full power cycle the unit needs a service visit, and on this range that usually means a replacement.

The panel voltage is just above the start level but there is not enough power behind it, which happens in low light. If it shows in strong sun with the panels well above the start voltage, the inverter DC stage is faulty. Bus faults are internal, so we treat them as a call.

A problem with the main capacitors inside the inverter, a common wear-out failure on units of this age. It cannot be checked from outside.

A fault in the DC to AC stage of the inverter, picked up by the other internal board. It cannot be checked from outside.

The DC to AC stage took too long to start. It is an internal fault that cannot be checked from outside.

Before connecting, the inverter tests the relay in its DC stage and the relay did not switch properly. It is a fault inside the unit.

Before connecting, the inverter tests the relay that joins it to the grid and the relay did not switch properly. It is a fault inside the unit and a common failure on this range.

The relay self-test before connecting took too long, which points to a problem with the relays inside the unit.

The inverter measured too much DC in the current it sends to the grid. It does not lock out; it retries. A one-off can be grid distortion or a sudden cloud change; if it repeats all day the inverter output stage is faulty. DC on the AC side is a protection fault, so we treat it as a call.

A fault inside the inverter that cannot be checked from outside. If it survives a full power cycle the unit needs a service visit.

The inverter is mis-reading its own internal reference voltage. It is a fault on the internal board and cannot be checked from outside.

An internal measurement check failed: on older PVI units it is the insulation measurement circuit, on UNO-DM units the mid-bus voltage. Either way it is inside the unit.

The voltage across the inverter output relay is out of range, which the ABB manual lists as a damaged output relay. It is one of the most common end-of-life codes on this range and cannot be fixed from outside.

During its start-up check of the string voltages the inverter found a string connected the wrong way round. On a system that has run for years it means something was disturbed, usually after other work on the roof or isolators.

Older Aurora units show Int.Error for most faults on the internal boards and log the E-code behind it. Note the E number from the display or the event log; whatever the number, it is a fault inside the unit.

The inverter cannot talk to the memory board that stores its daily production figures. It usually keeps producing, but the logged totals and monitoring will be wrong until it is fixed. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The voltage inside the inverter did not reach its working level, usually because there is not enough sun behind the panel voltage first thing in the morning. It is a warning, not an error, and clears itself; if it shows in strong sun the start-up voltage setting or the DC stage needs checking.

The inverter is in a locked state because its commissioning was never finished, which can happen after a board swap or a settings reset. It needs the set-up completed with the service tools. A protection lockout means the inverter found something it will not run with, so we treat it as a call.

The small internal battery that keeps the inverter clock is flat. Production is not affected, but the date and time will reset and the logged figures will be out of order until it is replaced. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter is set for parallel inputs but the two input channels are more than 20 volts apart, so either the setting is wrong or one string has a problem. A setting and wiring check, not a panel fault.

The time on the display is more than a minute out from the inverter internal clock, which points to a clock circuit fault. Production is not affected but the logs will be wrong. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter has logged a low-sun warning and is waiting for the panel voltage to rise above its start-up level. Normal at dawn, dusk and in heavy cloud; a problem only if it never leaves this screen on a clear day.