AFCI trip, battery not charging, FusionSolar offline — we diagnose SUN2000 systems remotely in a single session.
Book your free remote diagnosticSee the Solar Health PlanSafety: do not open inverter or battery enclosures. If you smell burning or see arcing, isolate at the consumer unit and call 999.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Every fault below has a proven diagnostic path. Click through for the specific page or book a diagnostic if you're unsure.
The AFCI (Arc Fault Circuit Interrupter) detects abnormal arc conditions on DC cabling. A single trip may clear after power cycle if the arc is not persistent. Repeated trips indicate a real fault in MC4 connectors, cable insulation, or junction boxes. Inspect for damage before clearing.
See diagnostic guide →Inverter powered but generating zero power. Could be a DC string fault, isolation trip, or protection event not yet cleared. Check the FusionSolar app and inverter LED display for specific alarm codes before restarting.
See diagnostic guide →Inverter generating below expected output. May indicate a string performance issue, soiled panels, or configuration fault. We review FusionSolar historical data and string-level metrics to identify the loss pattern.
See diagnostic guide →LUNA2000 modules stuck at low state of charge. Causes include incorrect working mode settings in FusionSolar, BMS communication fault with battery modules, low SoC protection, or grid code fault preventing solar charge. Check FusionSolar app alarm log.
See diagnostic guide →Battery modules show offline alarm. Usually caused by firmware mismatch between inverter and battery, loose CAN cable, or battery module protection state after a power event. We diagnose the communication path using FusionSolar data.
See diagnostic guide →Backup power does not engage during grid outage. SPS mode requires dedicated wiring to the backup circuit and must be enabled in FusionSolar settings. Also requires sufficient battery SoC above minimum threshold (typically 20%).
See diagnostic guide →App or FusionSolar portal shows no data. Could be local WiFi loss at Smart Logger, a gateway hardware fault, a cloud-side outage, or firmware update that broke cloud connectivity. Inverter may still be generating.
See diagnostic guide →Huawei Smart Logger or WiFi dongle cannot establish network connection. Usually requires reconfiguration after router change or password update. The logger must be set to 2.4GHz band if your router supports band-steering.
See diagnostic guide →Seeing an error code in FusionSolar or on the inverter? Our full Huawei fault code index explains what each code means, common causes, and safe next steps.
Fault code categories
We review FusionSolar data, app settings, and error history to identify the exact fault without a site visit.
Installer gone bust, FusionSolar access lost, account locked. We recover portal access and rebuild documentation.
CAN cable rewire, BMS communication fix, SPS circuit verification, firmware update, hardware swap. Targeted visit — no guesswork on arrival.
Download datasheets, installation manuals and warranty documents for Huawei SUN2000 inverters and LUNA2000 batteries. Self-hosted and always current.
Huawei is one of the UK's fastest-growing solar battery brands, known for their hybrid inverters, all-in-one units, and modular battery stacks. The SUN2000 inverter series (G3, G4, G5 generations) pairs with the LUNA2000 battery for scalable storage. Their systems communicate over a CAN bus between the inverter and battery — a common fault path when communication breaks down after firmware updates or power interruptions.
The FusionSolar app and portal provide monitoring and configuration. When the Smart Logger or WiFi dongle loses connection — due to router changes, firmware bugs, or hardware failure — the portal goes dark even though the system may still be generating. The SPS (Sustainable Power Supply) backup mode requires both dedicated wiring and correct FusionSolar settings to engage during grid outages.
Huawei systems work with grid codes G98 (≤3.68kW) and G99 (>3.68kW) in the UK. Incorrect configuration can cause repeated disconnections. Many reported issues with battery not charging trace back to incorrect charge window settings, BMS communication faults, or grid code misconfigurations. If you're searching for Huawei repair UK, Huawei battery not charging, Huawei AFCI fault, Huawei FusionSolar offline, or Huawei BMS communication fault, STS provides independent diagnostic and repair support across the UK — not affiliated with Huawei.
STS supports all major inverter and battery brands — not just Huawei. If you have a mixed-brand system or are comparing options, visit the brand hub.
Tell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
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