Solar · Error codes
Why does my Huawei inverter show 2034 Grid Overvoltage?
Short answer
2034 means mains voltage was above the inverter's protection threshold, so it disconnected. Occasional alarms recover automatically. If frequent, Huawei says check grid voltage; thresholds may only be changed with the power operator's consent. In the UK that means your installer and DNO (SUN2000-L1 manual Issue 06, checked 24 September 2026).
Last checked 24 September 2026 · 1 source
In more detail
- Often seen on streets with lots of solar export on sunny days.
- Output may also be curtailed by grid-code power limits.
The facts, dated
- 01Huawei: modify the grid overvoltage protection threshold only 'with the consent of the local power operator'.
manufacturer · UK · checked 24 September 2026 · solar.huawei.com
Sources
- solar.huawei.com — solar.huawei.com/-/media/Solar/attachment/pdf/au/service/residential/SUN2000-2-6…
Last checked: 24 September 2026