How do I clear or fix error E0?

Measure the AC voltage at the inverter terminals with a multimeter. If voltage is consistently below the inverter's minimum threshold (typically 184 VAC for 230 V systems), contact your utility provider.

Felicity inverter error E0

Grid Volt 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 Volt Low — Grid voltage below acceptable range.

Cause: AC grid voltage has dropped below the inverter's safe operating range. Most commonly caused by utility voltage sag, undersized wiring between the meter and the inverter, or loose AC terminal connections.

How to fix it

Measure the AC voltage at the inverter terminals with a multimeter.
If voltage is consistently below the inverter's minimum threshold (typically 184 VAC for 230 V systems), contact your utility provider.
Verify all AC wiring is correctly sized for the inverter's rated current, and retighten the grid terminal block.

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 E0 mean on a Felicity inverter?: E0 means: Grid Volt Low. AC grid voltage has dropped below the inverter's safe operating range. Most commonly caused by utility voltage sag, undersized wiring between the meter and the inverter, or loose AC terminal connections.
Is error E0 a fault or a warning?: E0 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 E0?: Measure the AC voltage at the inverter terminals with a multimeter. If voltage is consistently below the inverter's minimum threshold (typically 184 VAC for 230 V systems), contact your utility provider.

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.