Tesla Powerwall › Problems
Powerwall 3 shows PV isolation fault in the morning
A Powerwall 3 shows a PV isolation fault in the morning, and solar is blocked until it clears. This page covers what the code means, what to check first, and the cause behind it.
Error codes that go with this problem
| Code | What it means |
|---|---|
| PV isolation fault | The solar array's insulation resistance is below the threshold. Solar is blocked until the fault clears. |
What to check first
- Note whether the PV isolation fault shows every morning and what time it clears. In the reported case solar stayed blocked until the fault cleared on its own by mid-morning.
- If the fault keeps coming back, ask your installer to inspect the solar string connectors and wiring for moisture getting in or damaged insulation.
The causes and the fixes
Partners see the causes behind this problem, most common first, the checks that tell them apart, and the fix for each, with part numbers and recent prices when a part is involved.