- Solar and energy
- Solar inverter
2004
Huawei inverter 2004: DC overvoltage was detected
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
Huawei alarm 2004 means DC overvoltage was detected. The deciding evidence is whether the alarm follows a string reconfiguration, cold/high-irradiance start or changed module specification. 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 2004 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 if the alarm is active. Use only FusionSolar monitoring from a safe location; do not touch PV connectors, strings, DC switches or rooftop equipment. Record whether the alarm follows a string reconfiguration, cold/high-irradiance start or changed module specification; do not change several settings or circuits at once.
- Respect the electrical stop boundary
If it clears, that does not prove wiring or array configuration is safe; recurrence means keep the system off until the named DC branch is measured.
What you must never do
- Do not attempt this professional task: Measured installer handoff for 2004
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 2004
What they doMeasure isolated DC input and compare every string’s cold open-circuit voltage and topology with the inverter’s exact DC limits.
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 2004
- alarme Huawei 2004
- allarme Huawei 2004
- erreur SUN2000 2004
- error SUN2000 2004
- errore SUN2000 2004
- Huawei alarm 2004
- Huawei inverter 2004
- Huawei Wechselrichter 2004
- inversor Huawei 2004
- inverter Huawei 2004
- onduleur Huawei 2004
- SUN2000 error 2004
- SUN2000 Fehler 2004
What it means
Huawei’s official inverter alarm reference defines 2004 as a condition in which DC overvoltage was detected. It reports a controller/protection state, not a universal failed part. Record whether the alarm follows a string reconfiguration, cold/high-irradiance start or changed module specification. The next proof is measured: Measure isolated DC input and compare every string’s cold open-circuit voltage and topology with the inverter’s exact DC limits.
Warnings and stop conditions
- Criticalsource verified
PV strings can remain at dangerous DC voltage in daylight even when the inverter is off. Do not disconnect, cover, probe or handle DC connectors or rooftop modules; use a qualified PV installer.
Evidence: Huawei Inverter Alarm Reference
Sources and technical references
- 1
Huawei Inverter Alarm Reference
Huawei Digital Power · 2025 · official_doc
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