Huawei error codes explained

The PV array is not properly configured. Excessive PV modules are connected in series to the PV string, and therefore the open-circuit voltage exceeds the maximum SUN2000 operating voltage. Cause ID = 1, 2 ● 1: The PV1 input voltage is high. ● 2: The PV2 input voltage is high.

What you can do

• Check solar generation in the app compared with similar days
• Do not touch the DC isolators, cables or connectors, and don't go on the roof
• If it doesn't clear by itself, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

The PV string power cables arc or are in poor contact. Cause ID = 1, 2 ● 1: PV1 DC arc fault ● 2: PV2 DC arc fault

What you can do

• Keep clear of the inverter, panels and DC cables, and do not touch any isolators
• Note the code, date and time, and check whether the alarm is still showing in the app
• If you smell burning or see smoke, get everyone out and call 000
• Call a licensed electrician or Total Solar - an arc fault means a DC wiring or connector problem that must be inspected

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

The PV string is reversely connected. Cause ID = 1, 2 ● 1: PV1 is reversely connected. ● 2: PV2 is reversely connected.

What you can do

• Do not touch the DC isolators, cables or connectors
• Call your installer - this points to a wiring problem that needs a licensed electrician

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

The AFCI check fails. Cause ID = 1, 2 ● 1: The AFCI check circuit is abnormal. ● 2: The AFCI circuit is faulty.

What you can do

• Keep clear of the inverter, panels and DC cables, and do not touch any isolators
• Note the code, date and time, and check whether the alarm is still showing in the app
• If you smell burning or see smoke, get everyone out and call 000
• Call a licensed electrician or Total Solar - an arc fault means a DC wiring or connector problem that must be inspected

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 ● The power grid experiences an outage. ● The AC circuit is disconnected or the AC circuit breaker is OFF.

What you can do

• Check whether the rest of your house or street has power, and check your network operator's outage map
• Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician
• Once normal power is back the inverter usually reconnects on its own within a few minutes
• If the power is normal but the alarm stays, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by low voltage ride-through (LVRT).

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The grid voltage exceeds the higher threshold or the high voltage has lasted for more than the value specified by high voltage ride-through (HVRT).

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 Power grid exception: The actual power grid frequency is higher than the standard requirement for the local power grid.

What you can do

• This is caused by the mains frequency moving outside the allowed range, usually briefly
• The inverter reconnects by itself once the grid is stable
• If it keeps happening, note the times and call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 Power grid exception: The actual power grid frequency is lower than the standard requirement for the local power grid.

What you can do

• This is caused by the mains frequency moving outside the allowed range, usually briefly
• The inverter reconnects by itself once the grid is stable
• If it keeps happening, note the times and call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 Power grid exception: The actual grid frequency change rate does not comply with the local power grid standard.

What you can do

• This is caused by the mains frequency moving outside the allowed range, usually briefly
• The inverter reconnects by itself once the grid is stable
• If it keeps happening, note the times and call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The power grid voltage drops dramatically or the power grid is short- circuited. As a result, the SUN2000 transient output current exceeds the upper threshold and therefore the SUN2000 protection is triggered.

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The DC component of the SUN2000 output current exceeds the specified upper threshold.

What you can do

• Restart the system once using the owner shutdown/start-up steps in your manual
• If it comes back, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The insulation impedance of the input side to PE decreases when the SUN2000 is operating.

What you can do

• Do not touch the panels, rooftop isolators or DC cables
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If it clears by itself once things dry out, still let us know if it keeps returning
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 ● A short circuit occurs between the PV array and the ground. ● The ambient air of the PV array is damp and the insulation between the PV array and the ground is poor.

What you can do

• Do not touch the panels, rooftop isolators or DC cables
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If it clears by itself once things dry out, still let us know if it keeps returning
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 ● The SUN2000 is installed in a place with poor ventilation. ● The ambient temperature is higher than the upper threshold. ● The SUN2000 is not working properly.

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

An unrecoverable fault has occurred on a circuit inside the SUN2000. Cause ID = 1–12 ● 1: The Boost input is short-circuited. ● 2: The Boost input experiences overcurrent. ● 3: The control circuit is faulty. ● 4: The inverter circuit is abnormal. ● 5: The residual current sensor is faulty. ● 6: The temperature detection fails. ● 7: EEPROM read/write fails. ● 8: The auxiliary power supply is abnormal. ● 9: The grid-tied relay is abnormal. ● 10: The DC bus experiences overvoltage. ● 11: The DC bus experiences undervoltage. ● 12: The DC bus experiences voltage imbalance.

What you can do

• Keep clear and do not touch the inverter or cabling
• Note the code, date and time
• Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

The upgrade does not complete normally. Cause ID = 1–4, 7 ● 1. The software and hardware of the main controller do not match. ● 2: The main and auxiliary controller software versions do not match. ● 3: The monitoring and power controller software versions do not match. ● 4: The upgrade fails. ● 7: The optimizer upgrade fails.

What you can do

• Check solar generation in the app compared with similar days
• Do not touch the DC isolators, cables or connectors, and don't go on the roof
• If it doesn't clear by itself, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 ● The flash memory is insufficient. ● The flash memory has bad sectors.

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The smart power sensor is disconnected.

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery is faulty, disconnected, or the battery circuit breaker is OFF when the battery is running. Cause ID = 1–4 ● 1: The battery communication is abnormal. ● 2: The battery port experiences overcurrent. ● 3. The battery enabling cable is not properly connected. ● 4: The battery port voltage is abnormal.

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 When the power grid experiences an AC power outage, the SUN2000 detects islanding proactively.

What you can do

• Check whether the rest of your house or street has power, and check your network operator's outage map
• Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician
• Once normal power is back the inverter usually reconnects on its own within a few minutes
• If the power is normal but the alarm stays, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1/2 The output is overloaded or short-circuited.

What you can do

• Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit
• The system usually recovers by itself once the load drops
• If it keeps happening with normal loads, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

PV module configuration does not meet requirements, or the PV module output is reversely connected or short- circuited. Cause ID = 2, 3, 6, 7, 8, 9 ● 2: The PV string power or the number of optimizers connected in series in a PV string exceeds the upper threshold. ● 3: The number of optimizers connected in series in a PV string is less than the lower threshold, the PV string output is reversely connected, or the output of some optimizers in the PV string is reversely connected. ● 6: Under the same MPPT, the number of optimizers connected in series in PV strings connected in parallel is differe

What you can do

• Do not touch the DC isolators, cables or connectors
• Call your installer - this points to a wiring problem that needs a licensed electrician

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 An optimizer is faulty.

What you can do

• Check solar generation in the app compared with similar days
• Do not touch the DC isolators, cables or connectors, and don't go on the roof
• If it doesn't clear by itself, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Cause ID = 1 The inverter fails to communicate with the Smart Backup Box. Cause ID = 2 An unrecoverable fault occurs on a circuit inside the Smart Backup Box.

What you can do

• Check that your home Wi-Fi/internet is working and restart your router
• Wait an hour - monitoring often reconnects by itself
• If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer

SUN2000-(2KTL-6KTL)-L1 single-phase hybrid-ready inverter · Guide only. All work must be done by a licensed electrician. Get help with this code