The Complete Guide To Lux Power Inverter Error Codes

On a parallel Lux Power system, the inverters are not seeing the same AC supply: one is wired to a different phase, a breaker to one unit is off, or on the GEN models the units have different power ratings or only some are connected to a generator. Lux's step is to check the AC wiring between the paralleled inverters, which is an installer job.

On a three-phase parallel Lux Power system built from single-phase inverters, the phase each inverter is set to does not match how it is wired, or a phase has no inverter on it. Lux's step is to check the AC connections of the three-phase group and the phase setting on each unit, which is an installer job.

The inverter has found its UPS (backup) output and its grid input connected the wrong way round or crossed, so it will not run. The GEN models call it Load connect fault. It is an installation wiring error for an electrician to correct; a restart will not clear it.

The two processors inside the inverter disagree about the grid voltage they are measuring, so the unit stops as a safety precaution. The GEN models spell it Inconsistant. Lux's step is a restart, then contact support if it repeats; a sensing circuit has drifted and it is a service call.

The Lux Power hybrid cannot see mains power on its AC input. Usually the power is out, the solar supply main switch or breaker in the switchboard is off, or an AC connection is loose. A hybrid with a battery keeps the backup circuit running; it reconnects by itself once the grid is back.

The mains voltage at the inverter went outside the range it is allowed to export at, so it disconnected. It reconnects by itself; if it happens most sunny afternoons the AC run or the street voltage needs checking. Lux's step is simply to check the grid voltage.

The grid frequency went outside the inverter's limits for a moment and it disconnected. It reconnects by itself once the grid is steady; Lux's step is just to check the grid frequency.

The inverter found a short circuit on its UPS (backup) output, almost always a faulty appliance or a wiring fault on the backed-up circuit, and it has switched the output off. Lux's step is to check the load for a short, switch the load off and restart. Finding the short is an electrician's job if switching appliances off does not clear it.

The inverter has detected power coming into its UPS (backup) output instead of going out, which means the backup circuit has been wired so that the grid or another source feeds it. This is an installation wiring error and the inverter will not run the backup output until an electrician corrects it.

The voltage from a string of panels is above what the inverter is rated for, which can damage it. It is most likely on a cold, bright morning with a string that has too many panels for the model. Lux's step is to check the PV input connection and the string voltage; the string design is the installer's to fix, not a restart.

The inverter sees a short circuit across both of its solar string inputs at once, usually damaged DC cables, a crushed connector or strings wired wrongly, and it stops. Lux's step is to disconnect both strings and restart, then contact support; checking DC wiring is an electrician's job.

On a parallel Lux Power system, the inverters have lost the timing signal they share over the parallel cable (E028 the sync signal, E029 the sync trigger), so they cannot run together. Lux's step is to check the CAN cable is in the right COM port and seated. A single inverter should never show it.

While running off-grid, the inverter measured a DC component on its backup (load) output that should not be there, which can upset appliances and the inverter's own protection. The SNA off-grid model shows it as EPS DCV high. Lux's step is a restart, then contact the supplier if it stays; it points at the output stage. A protection lockout means the inverter found something it will not run with, so we treat it as a call.

The inverter sees a short circuit on one of its solar string inputs, usually a damaged DC cable, a crushed connector or a string wired wrongly. Lux's step is to check and fix the PV input connection, which is an electrician's job on the DC side.

During a blackout the appliances on the backup (UPS) circuit are drawing more than the inverter can supply, often an air conditioner, oven, pump or kettle starting together. Switch the heavy appliances off and it recovers; if it trips with little connected the backup wiring or settings need checking. Lux's step is to check and adjust the UPS load.

The inverter measured too much voltage between neutral and earth (the GEN manual says over 30 V), which means the neutral at the inverter is loose, missing or wired wrongly. Lux's step is to check the neutral connection. It is a wiring matter for an electrician and can be a safety issue, so do not keep restarting it.

On the GEN-LB-EU hybrids, the module that watches for current leaking to earth has failed its own check, so the inverter will not run without it. Lux's step is a restart, then contact the supplier if it stays. It is a board-level fault, not a wiring one.

On the LXP 7.6K to 12K hybrids fitted with arc fault detection, W001 means the inverter has lost contact with its arc detection board, so it can no longer watch for a DC arc. Lux's step is a restart, then contact support if it stays. It is a board-level fault and the safety function is off until it is fixed.

On the LXP 7.6K to 12K hybrids, W002 AFCI High means the inverter detected the signature of an electrical arc in the solar DC wiring, which is a fire risk, usually a loose or corroded connector or a damaged cable on the roof. Do not keep restarting it: the DC wiring needs to be inspected by an electrician before the system runs again.

The inverter found too little insulation between the solar wiring and earth, usually water in a rooftop connector or isolator, a chafed cable or a damaged panel. A morning warning that clears by midday points to dew; one that stays is an electrical safety issue and needs an electrician. Lux's manual only says restart and call, which is not enough on its own.

The inverter measured more current leaking to earth than is safe, from the solar side or the AC side, and disconnected. The usual causes are water in a rooftop connector, a damaged cable or an earth fault on a backed-up circuit. The GEN models call it Trip by gfci high and say to check for a ground fault on the grid and load side. It is an electrician's job.

On a parallel Lux Power system, E009 means the inverters cannot find the one set as primary (master): the parallel cable to it is loose or none of the units has been set as primary. A single inverter set as a subordinate by mistake will show it too. On the LXP 7.6K to 12K the manual lists E009 as the fan not turning instead. Lux's step is to check the cables and the primary setting. A fan fault lets the inverter overheat, so we treat it as a call.

The inverter has either run too hot (the GEN models say heat sink temperature too high, the SNA says switch off for ten minutes and let it cool) or lost its temperature sensor, which the LXP 7.6K to 12K shows as NTC Open. Lux's step is to check the NTC connection, which is inside the unit, so a sensor fault is a service call; a plain overheat clears once the inverter cools.

W008 to W011 on the LXP 7.6K to 12K hybrids cover a software version mismatch between the inverter's processors, a stuck cooling fan, a duplicated parallel address and too many subordinates. The manual's table does not line the numbers up clearly, so go by the words on the screen: a mismatch needs a Lux firmware update, a stuck fan needs cleaning or replacing, the parallel ones are settings. A fan fault lets the inverter overheat, so we treat it as a call.

The processors inside the Lux Power hybrid have stopped talking to each other, so the inverter shuts down. The LXP 7.6K to 12K manual labels E000 as battery communication fault 1 and the newer GEN models show it as an M3 or M8 Tx or Rx failure, but the fix is the same: Lux says restart once and contact support if it stays. It is a board-level fault.

On the LXP 7.6K to 12K hybrids, E005 means the inverter's start-up self-test of its grid protection did not pass, so it will not connect. A restart often clears it; if it fails again the protection settings or a sensing circuit need checking by the installer. The LXP 3-6K reports the same thing as warning W005. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call.

On a parallel Lux Power system, two or more inverters have been set as primary (master). Only one is allowed; the others must be set as subordinates. It is a setting in the installer menu, not a hardware fault, and the system will not run properly until it is corrected. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The inverter's internal DC bus has shorted, a hardware failure in the power stage. The LXP 7.6K to 12K manual simply says contact Lux; the GEN models show it as Bus short circuit. It is not something a restart fixes and the unit needs a service call.

The relay that connects the Lux Power hybrid to the grid failed its self-test, so the inverter will not connect. Lux's step is a restart, then contact support if it stays. A relay that has welded or worn is an internal repair.

E017, E018 and E031 are the other internal communication faults between the processors inside the Lux Power hybrid, and the inverter stops. Lux's instruction for all three is the same: restart once and contact support if the fault stays. They are board-level faults.

The internal DC bus went above its limit, usually because the string voltage is too high for the inverter on a cold bright morning, or at the moment of a blackout switch-over. Lux says wait for the inverter to restart itself and only call if it repeats several times. The GEN models call it Vbus over range and point at the string voltage.

A fast over-current trip inside the inverter, which the GEN models call Hard over curr. It can follow a heavy load starting on the backup circuit or a grid disturbance, but repeated trips point to a failing power stage. Lux's step is a restart, then contact support if it stays.

A general internal fault, which the SNA and GEN manuals narrow down to the bus sampling circuit (the inverter reading its DC bus lower than the PV input). Lux's step is a restart, then contact support if it stays. It is a board-level fault.

The Lux Power hybrid's start-up self-test of its grid protection did not pass, so it will not connect to the grid. Lux's step is a restart, then contact support if it fails again; the protection settings or a sensing circuit then need checking by the installer. A failed self-test means the inverter cannot prove its own protection works, so we treat it as a call.

The inverter measured too much direct current mixed into its AC output, which the grid rules do not allow, so it disconnected. A one-off clears with a restart; if it keeps happening the output stage or its sensing needs checking by the installer. DC on the AC side is a protection fault, so we treat it as a call.

The energy meter or its current clamp is reading the wrong way round, so the inverter thinks the house is importing when it is exporting and self-consumption and export limiting behave oddly. Lux's step is to check and fix the meter connection, which means turning the CT round or swapping the meter wiring, an installer job.

On the LXP 7.6K to 12K hybrids, E002 Low battery means the battery has run down to where the inverter will not discharge it any further, usually after a long blackout or a run of cloudy days. It clears once the battery charges from solar or grid. On the SNA off-grid model the same number is Bat On Mos Fail, a hardware fault in the battery switching circuit that needs service. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

On the LXP 7.6K to 12K hybrids, E004 means the battery has told the inverter it is not available for either charging or discharging, usually a protection inside the battery (temperature, cell voltage or a fault) or the wrong battery type selected. Lux's step is a restart; if the battery still refuses, its own fault light will say why and the installer or battery maker needs to look. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The Lux Power hybrid cannot talk to the battery's management system, so it cannot charge or discharge it safely; solar and grid supply keep working. Usually the wrong battery brand selected in the inverter, a communication cable with the wrong pinout or a loose plug, or the battery switched off. Lux's steps are to check the cable and the battery brand setting, then contact support.

The battery's own management system has told the inverter it has a fault, so the inverter stops using it; solar and grid supply continue. Lux's steps are to restart the battery and, if the warning stays, contact Lux or the battery maker. The battery's own display or lights will usually say what the fault is.

The battery voltage is above the range the inverter expects (the GEN manual gives 59.9 V on a 48 V system), which usually means the charge voltage or battery type settings do not match the battery, or the battery is being overcharged. Lux's step is to check the battery connection and the voltage against the specification, which is an installer job.

The battery voltage has dropped below the low warning level (the GEN manual gives 40 V on a 48 V system), so backup and night-time discharge stop until it charges again. Normal after a long blackout or a run of cloudy days; a problem if it never recovers, which can mean a flat battery that needs waking or a loose battery connection.

The inverter cannot see any battery on its battery terminals: the battery breaker or fuse is open, the battery is switched off, or a battery cable is loose. Solar and grid supply keep working but there is no storage or backup until it is reconnected. Lux's step is to check the battery connection, breaker and fuse, which is an installer job.

The LXP hybrid's stored model value is wrong or corrupted, which can follow a firmware update or a factory setting error, and it will not run until it is reset. On the LXP 7.6K to 12K the same number is Battery over temperature, the battery reporting it is too hot. Lux's step for both is a restart and then a call to support.

On the LXP 7.6K to 12K hybrids, E003 means the inverter has lost contact with the energy meter at the switchboard, so it cannot tell how much the house is using or exporting and stops. Usually a loose RS485 cable or a meter that has lost power. Lux's step is a restart, then the installer to check the cable.

The inverter's screen has lost contact with the control processor. On the LXP 7.6K to 12K it is fault E007; on the LXP 3-6K it is warning W007 and on the GEN models Lcd com failure. The inverter itself usually keeps running and the Lux portal still works; a restart often fixes it, otherwise the display board needs service.

On a system with two or more Lux Power hybrids wired together, E008 means the CAN link between them has dropped out: a loose parallel cable, the end-of-line resistor switch in the wrong position, or the safety standard switch set wrongly. A single inverter should never show it. On the SNA off-grid model the same number is CT Fail, a failed current clamp.

The Lux Power hybrid has lost contact with the energy meter or CT at the switchboard, so it cannot see what the house is importing or exporting; self-consumption and export limiting stop working properly but solar and the battery keep running. Lux's step is to fix the communication cable, which is an installer job.