- Solar and energy
- Solar inverter
2002
Huawei inverter 2002: a DC arc fault was detected
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
Huawei alarm 2002 means a DC arc fault was detected. The deciding evidence is the cause ID/string or MPPT named by FusionSolar and whether the event repeats under similar irradiance. This is an installer-grade electrical alarm: do not infer or buy a component from the ID alone.
Safety first
What to do now
- Preserve the exact alarm context
Save a screenshot of 2002 with timestamp, cause ID, inverter model/serial, firmware, operating power, affected string/MPPT/phase and weather. Do not clear the alarm first.
- Collect the safe discriminator
Leave generation stopped and keep away from PV/DC equipment. Do not clear AFCI, restart repeatedly or touch connectors; an arc or failed arc-protection path can create fire risk. Record the cause ID/string or MPPT named by FusionSolar and whether the event repeats under similar irradiance; do not change several settings or circuits at once.
- Respect the electrical stop boundary
Do not treat a cleared alarm as a repair. The named arc/AFCI path must be inspected and proven before generation resumes.
What you must never do
- Do not attempt this professional task: Measured installer handoff for 2002
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured installer handoff for 2002
What they doIsolate the named DC branch using the model procedure, inspect every connector and cable for poor contact or arcing, and prove the repair before clearing AFCI.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Huawei
- Product type
- Solar inverter
Known code variants
- alarma Huawei 2002
- alarme Huawei 2002
- allarme Huawei 2002
- erreur SUN2000 2002
- error SUN2000 2002
- errore SUN2000 2002
- Huawei alarm 2002
- Huawei inverter 2002
- Huawei Wechselrichter 2002
- inversor Huawei 2002
- inverter Huawei 2002
- onduleur Huawei 2002
- SUN2000 error 2002
- SUN2000 Fehler 2002
What it means
Huawei’s official inverter alarm reference defines 2002 as a condition in which a DC arc fault was detected. It reports a controller/protection state, not a universal failed part. Record the cause ID/string or MPPT named by FusionSolar and whether the event repeats under similar irradiance. The next proof is measured: Isolate the named DC branch using the model procedure, inspect every connector and cable for poor contact or arcing, and prove the repair before clearing AFCI.
Warnings and stop conditions
- Criticalsource verified
A DC arc can cause fire and PV conductors remain energised in daylight. Keep clear, leave the protected system stopped and call a qualified PV installer; call emergency services for smoke, flame or burning smell.
Evidence: Huawei Inverter Alarm Reference
Sources and technical references
- 1
Huawei Inverter Alarm Reference
Huawei Digital Power · 2025 · official_doc
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