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Usually self-clears

Deye F23: AC Leakage Current (Transient)

Updated June 2026 · Reviewed for technical accuracy · ~3 min read

F23 means the inverter briefly detected leakage current to ground above its threshold. The word that matters is transient: it's often a passing event, commonly caused by moisture in the panel wiring after rain or heavy dew. It frequently clears after one or two automatic restarts. If it keeps returning, though, it points to a real wiring or grounding issue that needs a look.

What usually causes F23

  • Moisture or condensation in a DC connector, junction box, or cable entry, the most common cause, especially early morning or after rain.
  • Aging or slightly damaged cable insulation letting a small current leak.
  • A grounding issue in the PV array or system earth.
  • High humidity generally, which can push a marginal system over the threshold.

The safe fix, step by step

Before you start Don't open connectors or the inverter. Inspecting or repairing DC wiring is an installer job. Your safe steps are to let it self-clear and watch the pattern.
  1. Let it self-clear. F23 often clears after one or two automatic restarts, especially once morning moisture dries off.
  2. Note the pattern. Does it only happen early morning, after rain, or in humid weather? That points to moisture and usually isn't an emergency.
  3. Do one safe power-cycle if needed. AC off, then DC isolator off, wait 5 minutes, restart.
  4. Watch the clock. If F23 persists for more than about an hour, or returns again and again even in dry conditions, it's no longer just transient moisture.

Quick decision flowchart

F23 appears
↓ does it clear within an hour, mostly in damp conditions?
✅ Yes → likely transient moisture. Keep an eye on it; not urgent.
❌ No, it persists or returns when dry → real leakage or grounding issue.
↓
If it persists or recurs in dry weather, book your installer to inspect the DC connectors, cables, and grounding.
When to call a professional Persistent or dry-weather F23 means a genuine insulation, connector, or grounding fault. Leakage current is a safety matter, so have a licensed installer inspect the PV wiring rather than ignoring repeated alarms.

Related Deye codes

F24, DC insulation failure F08, GFDI relay failure F63, Arc fault

FAQ

F23 shows every morning then goes away. Is that a problem?

That classic pattern usually means overnight moisture or dew on the DC wiring that burns off as things dry and warm up. It's worth mentioning to your installer at the next service, but a brief morning F23 that clears is rarely urgent.

Can I fix the moisture myself?

No. Finding and sealing a damp connector or junction is DC work for a qualified installer. You can note the pattern and report it, but don't open connectors yourself.

Is leakage current dangerous?

Leakage-current protection exists for safety, so a persistent F23 should be taken seriously. A one-off transient that self-clears is the protection doing its job; a recurring one needs inspection.

Sources

  • Deye Hybrid Inverter User Manual (F23 = "AC leakage current is transient over current"; inspect PV cable grounding, restart, contact support if it continues).
  • Deye dealer technical references for leakage-current codes.
⚠️ Safety disclaimer. Leakage current involves electrical safety. Solar inverters carry lethal DC and AC voltage. This guide covers letting the code self-clear and a single safe power cycle only. Inspection and repair of DC wiring and grounding must be done by a licensed installer or electrician.