ARC- on a Solis S6-EH1P L-PLUS 48 V hybrids: AFCI failure - DC arc detected
Short answer
On a Solis inverter, ARC- means: AFCI failure - DC arc detected. 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: AFCI failure - DC arc detected.
Part involved: DC arc detection.
Likely causes:
- Loose PV connections, damaged cable/MC4.
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: unknown.
Manual reset: Installer checks and clears.
What you can check
- Read the full code and message on the inverter screen or in the SolisCloud 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).
- Do not touch DC cables or isolator; call your installer - arcing is a fire risk.
What the engineer will check
- Check all PV connections tight; inspect MC4s and cable damage; AFCI settings.
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
- User Manual for S6 Series Hybrid Inverter S6-EH1P(3-8)K-L-PLUS ↗ · Version 1.0 · page 55 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026