How do I clear or fix error E2?

This is almost always a utility-side issue and clears automatically when grid frequency returns to normal. If the fault persists during stable grid conditions, verify the inverter's grid code setting matches your region (50 Hz vs 60 Hz).

Felicity inverter error E2

Grid Freq Low

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

E-CHO-SI3KS2

InverterFault

Also applies to:E-CHO-SI5KS2E-CHO-SI8KS2

What it means

Grid Freq Low — Grid frequency below acceptable range.

Cause: Grid frequency has fallen below the regional minimum (typically 47-49 Hz for 50 Hz grids, 57-59 Hz for 60 Hz grids). The inverter trips offline to comply with anti-islanding standards.

How to fix it

This is almost always a utility-side issue and clears automatically when grid frequency returns to normal.
If the fault persists during stable grid conditions, verify the inverter's grid code setting matches your region (50 Hz vs 60 Hz).
Have an electrician confirm there is no isolated/islanded section of the local grid.

Source: E-CHO-SI3KS2-Operation-Manual.pdf, p.16 · E-CHO-SI5KS2-Operation-Manual.pdf · E-CHO-SI8KS2-Operation-Manual.pdf

Frequently asked questions

What does error E2 mean on a Felicity inverter?: E2 means: Grid Freq Low. Grid frequency has fallen below the regional minimum (typically 47-49 Hz for 50 Hz grids, 57-59 Hz for 60 Hz grids). The inverter trips offline to comply with anti-islanding standards.
Is error E2 a fault or a warning?: E2 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
How do I clear or fix error E2?: This is almost always a utility-side issue and clears automatically when grid frequency returns to normal. If the fault persists during stable grid conditions, verify the inverter's grid code setting matches your region (50 Hz vs 60 Hz).

Related error codes

Other codes on the E-CHO-SI3KS2

All E-CHO-SI3KS2 codes All E-CHO-SI5KS2 codes All E-CHO-SI8KS2 codes

Prefer the full written guide? Read the complete Felicity inverter error-code guide

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.