Solar · Error codes
Solis PV ISO-PRO01 fault in the morning - what should I do?
Short answer
PV ISO-PRO01/02 means the inverter detected low insulation between the panel wiring and earth. Solis says if it only happens on rainy days or early mornings it is usually moisture on ageing modules and clears as conditions dry; otherwise installers test each string (S6 string manual 04/2024, checked 24 September 2026). Never touch DC cables yourself.
Last checked 24 September 2026 · 1 source
In more detail
- Record when it happens.
- Installer tests strings individually to locate the fault.
The facts, dated
- 01Solis: when weather is fine or humidity reduced, the error is cleared automatically.
manufacturer · UK · checked 24 September 2026 · solisinverters.com
Sources
- solisinverters.com — www.solisinverters.com/uploads/file/Solis_Manual_S6-GR1P(2,5-6)K-S_FN_EUR_V1,1(2…
Last checked: 24 September 2026