GoodWe DC Injection High
DC Injection High (error 12) means your GoodWe measured too much DC mixed into the AC current it feeds the grid. Grid rules cap this tightly, so the inverter trips to stay compliant. It is usually an internal sensing or output-stage matter rather than anything you wired, and a one-off may simply be a transient.
What usually causes it
- A transient at start-up or during a grid disturbance, which a restart clears.
- Drift in the output stage that lets a little DC through.
- A sensing or measurement fault inside the inverter.
- Rarely, a grid or wiring interaction, worth ruling out if it is frequent.
How to handle it safely
- Power-cycle once. Switch off the AC, then the DC isolator, wait 5 minutes, then restart. A transient DC injection trip often clears here.
- Watch whether it returns. A single event that does not repeat needs no further action.
- If it keeps tripping, stop resetting it and contact your installer or GoodWe. A repeated DC Injection High points to the output stage or sensing and needs a proper diagnosis.
Related GoodWe codes
FAQ
What is DC injection?
Grid inverters are meant to feed clean AC. DC injection is a small unwanted DC component mixed into that AC current. Grid rules cap it very tightly because DC can saturate transformers and meters, so the inverter trips if it measures too much.
Is DC Injection High harmful?
The trip itself is protective and keeps you compliant with grid rules, so it is doing the right thing. A one-off may just be a transient, but if it keeps returning it points to the inverter's output stage or sensing and needs servicing rather than repeated resets.
Helpful guides
Sources
- GoodWe inverter user manual and error-message list (DC Injection High / error 12 = DC component of the AC output above the grid limit; restart, service if persistent).
- General grid-tie inverter DC-injection limit guidance.