208-F07 on a myenergi libbi: PV ISO Under Fault - PV insulation resistance low
Short answer
On a myenergi inverter, 208-F07 means: PV ISO Under Fault - PV insulation resistance low. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: PV ISO Under Fault - PV insulation resistance low.
Likely causes:
- Low insulation resistance on PV array.
Is it safe?
Switch the inverter off at its isolator and call an engineer.
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: reboot libbi.
Manual reset: Reboot libbi controller/inverter per myenergi article.
What you can check
- Note the code shown on the libbi controller screen or in the myenergi app. Check the consumer-unit breaker feeding the libbi and the libbi AC isolator are ON. Reboot the libbi controller from its menu if myenergi's article says so. If the code stays, contact your installer or myenergi Technical Support. Do not touch PV cables.
What the engineer will check
- INSTALLER ONLY: check PV earth resistance and earthing quality; insulation-test strings.
Who to ask for: MCS battery installer / electrician trained on myenergi libbi.
Certification: MCS battery installer (MIS 3012) or competent electrician trained on the product; IET Code of Practice for Electrical Energy Storage Systems.
What you might notice
Sources
- myenergi Help Centre - Other libbi Codes (status codes 51-107, 183-187, F00-F18) ↗ · Help Centre article updated 2025-11-19 · page table · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026