The Complete Guide To Selectronic SP PRO Error Codes

On a three-phase or split-phase system, the phase rotation or phase angle of the generator or grid supply does not match the SP PRO, which Selectronic says is a wiring fault on the AC Source input. The inverters cannot sync to it. This needs an electrician; it is not something that clears itself.

On a three-phase or split-phase site with several SP PROs, the inverters have lost their SYNC link to each other, or one of them has shut down on a fault and taken the rest with it. The alert names the phase (L1, L2, L3 or Split) and the manager or worker unit. The whole system comes back once the faulted unit recovers; the SYNC leads and that unit's own alarm are the installer's starting point.

The SP PRO has not heard from the managed AC-coupled solar inverter over RS485 for more than 18 hours. Losing it overnight when the solar inverter sleeps is normal, so a day-long loss means the cable, the wireless link or the solar inverter has a fault. A related message, Invalid device detected, means a three-phase solar inverter is set up on a single-phase SP PRO or the reverse. Wiring faults need an electrician, so we treat them as a call.

The SP PRO's AC output voltage dropped because the house is drawing more than it can supply, usually a big appliance or several starting together. Low AC Alert warns that a shutdown is coming; Low AC Shutdown means it switched off and will try to restart. Turn off loads and it recovers. If it trips with little on, there may be a short circuit on a house circuit. Over-voltage, over-current and short-circuit faults can damage hardware, so we treat them as a call.

A shutdown input wired to the SP PRO (an emergency stop, a fire or building switch, or another device) is active, so the inverter has switched off its AC output on purpose. It comes back when that input is released. The thing to find is what is driving the input, not the inverter.

There is AC voltage on the SP PRO's load terminals while the inverter is off, which should never happen. Selectronic says it is either a stuck AC contactor inside the SP PRO or a wiring fault feeding the load side from somewhere else. It is an electrical safety matter for an electrician.

While connected to the generator or grid, the SP PRO shut down on over-current caused by a disturbance or a distorted supply voltage. Selectronic says an occasional one is fine; repeated ones mean a poor AC source, most often a generator that needs a service, or a wiring fault. Over-voltage, over-current and short-circuit faults can damage hardware, so we treat them as a call.

The SP PRO thinks the Silence Alarm button or the Generator button on its front panel is being held down, which can stop it reacting to a real press. Usually something is pressing on the panel or the button has stuck; if it persists the button needs a Selectronic service.

The SP PRO's cooling fan is not spinning, is running slow, or has reached the end of its rated life, or the fan filter in the base needs cleaning. The Attention LED shows yellow or flashing yellow. The inverter keeps running but will overheat and shut down under load until the fan is cleared or replaced; the fan guard and fan are the installer's job. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The SP PRO reached its maximum operating temperature and shut down (Overtemp LED red), or is about to (Hi Temperature Alert, Overtemp LED yellow). Selectronic says the cause is too much load, blocked airflow or a hot room. It restarts once it has cooled; the fan filter in the base and the space around the unit need to be kept clear. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The SP PRO's control board has lost its link to the Advanced Comms Card inside the unit, the card that handles monitoring and remote communications. The inverter keeps powering the house; monitoring and Select.live may drop out until the installer or Selectronic checks the card. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The SP PRO is reporting that its internal or output filter capacitors are at or near the end of their rated life (95 or 100 percent), or it has detected high-frequency ripple on its output that points to ageing capacitors. It keeps running, but Selectronic recommends the unit be returned for a capacitor replacement before it fails. The Attention LED flashes yellow. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

A large disturbance tripped the SP PRO's hardware protection and it shut down for a moment, then came back. Selectronic says an occasional one is fine; if it keeps happening there is a wiring fault or a very poor AC source such as a misbehaving generator, and the installer needs to find it. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The SP PRO has found a fault inside itself: the Attention LED flashes red (unit fault) or shows steady red (immediate attention required), and the output status LED shows a fault with no inverter output possible. The exact reason is in SP LINK under Attention Required. This is an inverter hardware matter for the installer and usually Selectronic service.

The SP PRO's safety monitor has found that the earth and neutral of the generator or grid supply are not at the same voltage, which means the earth-neutral link is missing or poor. That is a shock-safety matter in the supply wiring and needs an electrician; the SP PRO will not treat the supply as safe until it is fixed.

The battery bank voltage has risen above the Hi Battery Alert setting. The SP PRO is still running; the problem is a charger pushing too hard, usually a DC solar regulator set wrong or an AC-coupled solar inverter the SP PRO has lost control of. It clears when the voltage drops, but the cause needs an installer.

The SP PRO measures the voltage at the middle of the battery bank and it is further from half the bank voltage than allowed, which points to a weak cell or a poor connection in one half of the bank. If it shows after an equalise charge Selectronic treats it as a likely faulty cell. This is a battery bank problem for an off-grid installer.

The battery temperature sensor says the bank is above the Over Temp Protection limit. Selectronic's instruction is to turn the SP PRO to idle straight away (a long press of the ON button) and call the installer, because a battery heating up can mean a wrong charge setting, a runaway charger or a failing battery.

On a managed lithium battery, the battery's own management system has sent an alarm to the SP PRO; it shows as Battery Management - Alarm or as a BMS line naming the battery's own message. The detail is in SP LINK under Data View, Battery Management. If it persists it is a battery matter for the installer or the battery maker. Battery protection faults are not something to ride out at home, so we treat them as a call.

The SP PRO has put 120 percent of the battery's rated capacity back in but the voltage has not reached the target it expects for that state of charge. The battery is taking charge but not holding it, which points to a weak or hot bank. It is a battery health warning for the installer, not an inverter fault.

The battery bank voltage shot up above the SP PRO's limit, so it shut down instantly: the top battery LED flashes red. Selectronic calls this a battery or battery wiring fault; on a system with a solar regulator or AC-coupled solar it usually means the charge control has lost the battery. It needs an off-grid electrician.

The battery bank voltage dropped suddenly, far faster than a flat battery would, so the SP PRO shut down instantly: the bottom battery LED flashes red. Selectronic says this is a battery or battery wiring fault, such as a loose main cable, a blown fuse or a failed cell. It needs an off-grid electrician; do not keep restarting it.

The SP PRO has switched off the house because the battery bank voltage dropped to its shutdown limit. The bottom battery LED is red and the Shutdown LED red. It is protecting the battery, not faulty: it comes back by itself once the battery is recharged to the recovery voltage by the sun or the generator. If it happens often the battery, the charging or the load needs looking at.

The battery bank voltage is close to the SP PRO's shutdown point and it will switch off the house soon. This is about the battery bank, not the solar: the loads have used more than the sun or generator has put back. Reduce the load and get a charge source going; the bottom battery LED shows yellow and the Shutdown LED yellow.

The battery bank's state of charge is close to the shutdown SoC set in the SP PRO, so a shutdown is coming. The house is using more than the solar or generator is putting back into the battery. Reduce the load and get a charge source going.

The SP PRO has switched off the house because the battery's state of charge reached the shutdown SoC setting. It is protecting the battery bank and comes back by itself once the sun or the generator has recharged it to the recovery level. If it is happening regularly you are using more power than the system can put back.

The SP PRO's front panel stays dark (apart from the three blue AC LEDs along the top, which can light from an outside supply) when switched on. Selectronic says this almost always means no DC battery power is reaching it: a main battery fuse or breaker is open, or the main battery wiring has a fault. That is an electrician's check, not a reason to keep retrying.

All the battery LEDs flash red when the SP PRO is being run past its low battery limits on purpose: the emergency Low DC Shutdown Override (Just Go on series 1) or the AC Coupled Low DC Recovery mode that uses the solar to recover a flat battery. Not a fault, but Selectronic warns the override can damage the batteries, so use as little power as possible until the bank has recovered.

The SP PRO has raised the frequency to tell the AC-coupled solar inverter to back off or disconnect, which is normal when the grid is off and the battery is full or the charge target is reached. On a managed system with a managed AC-coupled solar inverter it can also mean the SP PRO lost comms control of it, which the installer should check.

The small Battery Sense (pre-charge) wires that let the SP PRO measure the battery voltage at the bank are not connected or have a fault, so it has fallen back to measuring inside the inverter. It keeps running, but charging will be less accurate until the installer fixes the sense wiring.

The sensor that tells the SP PRO how hot the battery bank is has failed or its wiring has: open circuit, short circuit, or a reading that is too high or too low to be real. Without it the charger cannot temperature-compensate the battery properly, so it needs an installer to test and replace the sensor.

On a system with AC-coupled solar, the SP PRO shut down as a last resort because the battery voltage stayed too high: it tried to push the AC-coupled solar inverter off by raising the frequency and that did not work. The fault is in the solar inverter's response or its comms to the SP PRO, not the battery.

The main battery cable, its fuse or breaker, or the battery bank itself is not delivering power to the SP PRO, even though the small sense wires still show the battery is there. The ON LED shows steady red. It is usually a blown main fuse, a tripped DC breaker or a loose main connection: an electrician job, and not one to keep retrying.

The contactor that connects the SP PRO to the generator or grid has not opened or closed when it should (stuck open, stuck closed, or inverter volts appearing on the AC Source terminals). This is the SP PRO's transfer relay or the external contactor and its wiring. The unit must not keep running like this; it needs an installer and usually a Selectronic service.

The SP PRO has flagged a generator fault: either the generator's own fault signal came in, or the SP PRO tried to start it three times without seeing generator voltage, or it saw voltage but could not sync for five minutes. The Generator LED flashes red and the SP PRO stops the generator. This is about the generator, not the solar or the inverter: the generator needs a service person.

The generator's fuel sensor has told the SP PRO the tank is low (Low Fuel: the generator keeps running) or empty (No Fuel: the SP PRO stops the generator). This is a generator matter, not a solar or inverter fault. Fill the tank and the alert clears.

The SP PRO started the generator but saw no AC voltage at its AC Source terminals, so it stopped the generator. Selectronic says this is a wiring fault, a tripped circuit breaker between the generator and the SP PRO, or a faulty generator. It is about the generator feed, not the solar.

The SP PRO wants to be able to start the generator but the Generator Available signal is not active, so it cannot. The Generator LED flashes yellow. Usually the generator's own switch is off auto, or the control wiring between the two has a problem. The house keeps running on battery and solar until the battery gets low.

Not a fault code but the most common off-grid complaint. Selectronic lists the causes: the house is using more than it did, peak loads trip the auto-start, the minimum run time is too short so it cycles overnight, the solar input has dropped, the battery has aged or has a failed cell, or an equalise charge is running. SP LINK's Generator Running Reason says which. Over-voltage, over-current and short-circuit faults can damage hardware, so we treat them as a call.

The grid (or generator) supply has failed or gone too high or too low, so the SP PRO has disconnected from it and is running the house from the battery and solar. If the disconnect beeper is enabled it sounds. Selectronic calls this normal operation: it reconnects once the supply is back in range. On a grid-connected hybrid, frequent trips mean high street voltage.

With the generator or grid connected, the house is drawing more than the SP PRO's rating plus the power limit set for that supply, so the supply is being overloaded. Turn off some loads. If you need to run that much, the system or the generator needs to be bigger.

The SP PRO can see the generator (or grid) but its voltage or frequency is too unstable or distorted to synchronise to, so it keeps running the house from the battery instead and cannot charge from that source. On a generator this means the generator needs repair or replacing; the SP PRO retries by itself. The AC Source LED is on but Transfer stays off.

The physical safety monitor switch inside the SP PRO is in a different position from the setting in SP LINK's Service Settings. It is a configuration mismatch from installation or a settings change, not a wiring fault, but only the installer can correct either side of it.

The SP PRO has loaded factory default settings, either from a front panel reset or because the stored settings became corrupt. After a factory reset it will not run until the installer sends the site configuration back with SP LINK; the ON LED slow-flashes red to show it is not configured. A plain System - Reset at power-up or after a firmware update is normal.