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Growatt Error 201: Residual Current Too High

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

Error 201 (residual current high) means the Growatt detected more leakage current to ground than its safety threshold allows, and stopped to protect you. Like its close cousin Error 203, a brief Error 201 is often caused by moisture in the panel wiring and clears after a restart. A persistent one points to a real wiring or grounding issue.

What usually causes Error 201

  • Moisture or damp in a DC connector or junction, common in the early morning or after rain.
  • Aging or damaged cable insulation allowing a small leakage current.
  • A grounding issue in the array or earthing.
  • High humidity generally, which can push a marginal system over the threshold.

How to handle it safely

No opening connectors Inspecting or repairing DC wiring is an installer job. Your safe steps are to restart and watch the pattern.
  1. Restart the inverter. Turn off the AC breaker, then the DC isolator, wait 5 minutes, restart. A transient, moisture-driven Error 201 often clears, especially as the day dries out.
  2. Watch the pattern. Does it happen mainly early morning, after rain, or in humid weather, then clear? That points to moisture and usually is not an emergency.
  3. If it persists, especially in dry weather, get it checked. A recurring Error 201 is a genuine leakage or grounding fault. Don't keep resetting it.
  4. Call your installer to inspect the DC connectors, cables and grounding.
When to bring in a professional Persistent or dry-weather Error 201 means a real 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 Growatt codes

Error 203, PV isolation low Error 420, GFCI fault Error 303, N-PE voltage

FAQ

Error 201 shows every morning then goes away.

That classic pattern usually means overnight moisture on the DC wiring that burns off as things dry and warm up. Worth mentioning at the next service, but a brief morning Error 201 that clears is rarely urgent.

What is the difference between Error 201 and Error 203?

Error 201 is too much leakage current to ground; Error 203 is low insulation resistance. They are related ground-related faults, both often moisture-driven, and both handled by restarting and, if persistent, an installer inspection.

Sources

  • Growatt inverter user manual and error-code reference (Error 201 = residual current high; restart, request maintenance if it persists).
  • Growatt installer documentation.
⚠️ Safety disclaimer. Leakage current involves electrical safety. Solar inverters carry lethal DC and AC voltage. This guide covers a safe power cycle and watching the pattern only. Inspection and repair of DC wiring and grounding must be done by a licensed installer or electrician.