How do I clear or fix error W11?

Power down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

W11

Felicity inverter error W11

Under frequency and rated alarm

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

T-REX-50KHP3G01

InverterFault

What it means

Under frequency and rated alarm — The frequency is too low, the inverter increases the power.

Cause: Grid frequency has fallen below the response threshold and the inverter raises its output power to help support the grid while the condition lasts.

How to fix it

Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Source: T-REX-50KHP3G01-user-manual-.pdf, p.45

Frequently asked questions

What does error W11 mean on a Felicity inverter?: W11 means: Under frequency and rated alarm. Grid frequency has fallen below the response threshold and the inverter raises its output power to help support the grid while the condition lasts.
Is error W11 a fault or a warning?: W11 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 W11?: Power down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Related error codes

Other codes on the T-REX-50KHP3G01

All T-REX-50KHP3G01 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.