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.
Huawei SUN2000 Support — AFCI Faults, Battery Charging & FusionSolar
- Not affiliated with Huawei
- All SUN2000 models — G3, G4, G5
- LUNA2000 battery diagnostics
AFCI trip or battery not charging — we diagnose SUN2000 systems remotely in a single session. FusionSolar offline? Follow our FusionSolar offline guide, and if the dongle needs reconnecting to your WiFi, we can set it up on site, from £195.
Book your free remote diagnosticFusionSolar offline guideSafety: do not open inverter or battery enclosures. If you smell burning or see arcing, isolate at the consumer unit and call 999.
When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.
Great service in supplying and fitting an additional GivEnergy battery. Went the extra mile in managing to fit the battery in to a difficult space.
Thank you for your diligence. On this occasion the battery was able to be saved but they have given a route to hopefully arrange a repair from the manufacturer.
I can’t praise this firm enough. After hearing my solar panels rattling in very windy conditions, I contacted Solar Tech (as my installers no longer trade). Ronald was fantastic at explaining what he thought the issue was likely to be. Communication was great throughout keeping me fully updated. The team worked really hard on the day to carry out the necessary work. I can now sleep soundly at night without worrying about the solar panels on my roof. I would thoroughly recommend this firm. Thank you for sorting the problem out.
I work for a Solar Company and had a customer with a GivEnergy system that we are not versed in. Ron took the time to explain the issues my customer was having and between us managed to rectify the issues. 10 Stars ... Thanks again STS
Common Huawei problems we diagnose
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 guideInverter powered but generating zero power. Could be a DC string fault, isolation trip, or protection event not yet cleared. Check the FusionSolar app for specific alarm codes, and the inverter's indicator lights for an alarm, before restarting.
See diagnostic guideInverter 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 guideLUNA2000 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 guideBattery 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 guideBackup 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 guideApp 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. The system usually keeps running, but offline doesn't prove it, so check the inverter's own screen or status lights.
See diagnostic guideHuawei Smart Logger or WiFi dongle cannot establish network connection. Usually requires reconfiguration after router change or password update. The WiFi dongle only joins a 2.4GHz network. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting.
See diagnostic guideHuawei fault code index
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
- · AFCI arc fault codes — DC cable protection
- · BMS communication alarms — battery faults
- · Grid protection faults — G98/G99 events
- · SPS storage protection — backup mode faults
- View all Huawei fault codes
What we do for Huawei owners
Remote Huawei Diagnostic
We review FusionSolar data, app settings, and error history to identify the exact fault without a site visit.
- Fault path identified
- Settings validation
- Written engineer summary
Huawei System Recovery
Installer gone bust, FusionSolar access lost, account locked. We recover portal access and rebuild documentation.
- Portal ownership transfer
- API access recovery
- Warranty evidence pack
On-Site Huawei Repair
CAN cable rewire, BMS communication fix, SPS circuit verification, firmware update, hardware swap. Targeted visit — no guesswork on arrival.
- Evidence-led targeted checks
- Safety-focused report
- Repair or replacement path
Huawei datasheets, manuals & warranty PDFs
Download datasheets, installation manuals and warranty documents for Huawei SUN2000 inverters and LUNA2000 batteries. Self-hosted and always current.
- Product datasheets & specifications
- Installation & commissioning manuals
- Warranty terms & coverage documents
- App & software setup guides
- Wiring diagrams
About Huawei systems — what you need to know
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, though the system usually keeps running, so check the inverter's own screen or status lights. 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 (up to 16 A per phase) and G99 (anything bigger) 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.
More Huawei help
Independent Huawei problems support across the UK — 6 faults STS engineers diagnose and repair. Free remote diagnostic, no fix no fee.
See all problemsEvery Huawei SUN2000 and LUNA2000 fault code explained — grid, isolation, BMS and AFCI alarms: what each means and how to clear it in FusionSolar.
See fault codesDownload Huawei datasheets, installation manuals, warranty PDFs, app guides and wiring diagrams. SUN2000 inverters, LUNA2000 batteries, and Smart Dongle.
See documents & downloadsHuawei questions answered
Ready to fix your Huawei system?
Tell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
- Not affiliated with Huawei
- No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
- On-site visits available
We’re busier than ever. Thank you for your patience.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
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Got a solar fault or need a quick answer? Drop us a message and we usually reply within a few minutes. Mon–Fri, 9am–7pm.