Pv Volt Fault on a Fox ESS H1 G2 single-phase hybrid inverter: PV voltage out of range
Short answer
On a Fox ESS inverter, Pv Volt Fault means: PV voltage out of range. The inverter keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: PV voltage out of range.
Part involved: PV input voltage.
When it shows: PV voltage outside inverter limits.
Likely causes:
- String voltage above/below inverter range (design error, too many modules in series on a cold day).
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Seek help if it persists.
What you can check
- Read the full code and message on the inverter screen or in the FoxCloud app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
What the engineer will check
- Measure string Voc; check string design against 600 V max input (H1 G2); correct stringing.
Who to ask for: MCS-certified solar PV installer (DC/string work) or the original installer.
Certification: Work on DC strings and inverter enclosures: competent PV installer (MCS-certified installer for warranty/SEG continuity); electrical work notifiable under Part P (England & Wales) or equivalent.
What you might notice
Sources
- H1(G2)/AC1(G2) Series User Manual ↗ · V1.0.8 · page 47 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026