The Complete Guide To Huawei Inverter Error Codes

The inverter cannot see the mains supply, so it has shut down. Either the power is out in your area, the solar supply main switch or AC breaker is off or has tripped, or an AC cable has come loose. It reconnects by itself once it sees the grid again.

The mains voltage dropped below the inverter's lower limit, or stayed low longer than the ride-through allows. It is a grid event and the inverter reconnects when the supply recovers; a repeat with the grid normal points to a loose AC connection.

The mains voltage at your switchboard went above the inverter's limit, which is common on sunny afternoons when the street is exporting a lot of solar. The inverter switches off to protect itself and reconnects once the voltage settles.

On a three-phase supply, the voltages on the three phases are too far apart for the inverter to run. It is a grid condition and the inverter reconnects when the phases balance.

The mains frequency went above the inverter's limit. It is a grid event and the inverter reconnects once the frequency returns to normal.

The mains frequency dropped below the inverter's limit. It is a grid event and the inverter reconnects once the frequency returns to normal.

The mains frequency is changing faster than the grid standard allows, which happens during network disturbances. The inverter reconnects once the grid is steady.

A serious fault inside the inverter's circuitry, or the inverter protecting itself from something outside such as the grid. Huawei allows one restart after five minutes with the AC and DC switched off; if the fault returns, or if the inverter looks damaged, it needs a service visit and should not be switched back on.

The inverter detected that the mains has gone and shut itself down so it does not keep energising the street (2070 is active detection, 2071 passive). It reconnects by itself once the grid is back.

A short spike in the mains voltage went above the inverter's transient limit. It is a grid event; the inverter reconnects once the voltage is steady, and a repeat means the street voltage or its peaks are too high.

The open circuit voltage of a solar string is above the inverter's maximum input, which means too many panels are wired in series for this inverter, especially on cold bright mornings. The inverter will not run that string until the design is corrected.

The voltage on the inverter's internal DC bus went above its limit, usually because the solar string voltage is too high for the inverter. It needs the string voltage checked before the inverter is switched back on.

A solar string is connected with positive and negative swapped. The inverter will not use it, and the connectors must only be unplugged by an electrician once the string current has dropped to almost nothing.

One string has fewer panels than the string paralleled with it, or is partly reversed, so current flows back into it instead of out. The inverter keeps running but that string is wasting power until the installer corrects it. Wiring faults need an electrician, so we treat them as a call.

One solar string is producing clearly less than the others. Long-term shading, dirt, or a failing panel are the usual causes. The inverter keeps running on the other strings.

The inverter has lost a solar string entirely: no voltage or current is arriving from it. A cable has come loose at the inverter or on the roof, a connector has failed, or a string fuse has blown. The other strings keep producing.

The inverter sees the active and neutral AC conductors connected the wrong way round. It is a wiring fault at installation and the inverter will not run until it is corrected.

While running the house from the battery, the appliances on the backup circuit are drawing more than the inverter can supply, or there is a short on that circuit, or the battery and sun are too low for the load. Turning off heavy appliances and clearing the alarm lets it recover. Over-voltage, over-current and short-circuit faults can damage hardware, so we treat them as a call.

The inverter cannot communicate with the Backup Box that supplies the house during an outage, or the box has an internal fault or wrong cabling. Backup will not work until it is fixed; solar production usually continues.

The inverter detected electrical arcing in the solar DC wiring, which is a fire risk, and has shut down (2002 and 2003 are the same fault on different models). A loose or corroded connector, a damaged cable or a failing panel junction box is the usual cause. It must not be cleared and restarted until the wiring has been inspected.

A solar string is shorted to earth, or the array is so damp that its insulation to earth has collapsed. This is a safety fault: the string wiring and panels need testing before the inverter runs again.

The inverter measured a short, or very low resistance, between an active AC conductor and earth. This is a wiring fault on the AC side and a safety issue: the inverter will not run until it is found and fixed.

While running, the inverter detected current leaking to earth from the solar wiring, which means the insulation between the DC side and earth has dropped. It is a safety trip: an occasional one after rain may clear, but a repeat means the cables or panels need testing.

The inverter cannot see a proper earth or neutral connection, so it refuses to run. A loose or missing earth or neutral at the inverter or switchboard, or an output mode setting that does not match the wiring, is the usual cause. It is a safety fault that needs an electrician.

The inverter measured too little insulation between the solar wiring and earth before it would start, which is a safety trip. Moisture in a connector or junction box after rain, a damaged cable, or a cracked panel are the usual causes. It may clear on a dry day, but a repeat needs testing.

The inverter is too hot and has cut back its output. Poor ventilation, direct sun on the unit or a very hot day are the usual causes. It recovers by itself as it cools, but a badly placed inverter will keep doing this all summer. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The inverter's external cooling fan is blocked, shorted or not getting power. The inverter keeps running but will overheat and cut back on hot days until the fan is cleaned or replaced. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

The fan inside the inverter is shorted, damaged or not getting power. Huawei allows one restart after five minutes; if the fault stays, the inverter needs service or replacement. A fan fault lets the inverter overheat, so we treat it as a call.

The circuit that watches for electrical arcing in the solar wiring failed its own self-test, so the inverter cannot rely on that safety function. Huawei's steps are to clear the alarm and restart, and to call for service if it comes back.

A sudden drop or short on the grid made the inverter's output current spike above its limit, so it tripped to protect itself. It recovers by itself once the grid is normal; if it keeps happening the AC wiring needs checking for a short.

The inverter measured too much DC in the current it sends to the grid. It recovers by itself; if it keeps returning it points to a problem inside the inverter. DC on the AC side is a protection fault, so we treat it as a call.

The inverter has a problem with the battery: it is faulty, has stopped communicating, its breaker has opened while running, or its cables are loose or on the wrong terminals. Solar production usually continues but the battery will not charge or discharge. Battery protection faults are not something to ride out at home, so we treat them as a call.

A firmware update did not finish, or the versions on the inverter, optimisers or communication module do not match. The inverter usually keeps producing; the installer or Huawei needs to run the update again.

The inverter has lost contact with the energy meter at the switchboard. Production continues, but export limiting, battery control and the import and export figures in the app rely on the meter, so the cable or meter needs checking.

On a system with Huawei optimisers, the number of optimisers or panels per string, the string wiring, or a reversed or open string does not match what the inverter expects. The installer needs to check the string layout and connections. Wiring faults need an electrician, so we treat them as a call.

One or more of the panel optimisers on the roof is faulty or has failed. The rest of the system keeps producing; the faulty unit shows in the app's optimiser layout and needs replacing on the roof.

The inverter's monitoring board has a memory problem, so the app may stop updating even though the inverter keeps producing. A restart often clears it; if not, the monitoring board needs replacing. Internal and hardware faults need testing with the right instruments, so we treat them as a call.