Siemens CU240S Error F00021: Earth fault

Siemens CU240S · taken from the manufacturer’s manual, pages cited

Fault codeF00021

The Siemens CU240S detected an earth fault due to phase current sum exceeding 5% of nominal inverter current. The manual lists no action for this code.

Model
Siemens CU240S
Display shows
Earth fault (F00021)
Type
Fault code
Source
Manual p. 381

What F00021 means

Earth fault p. 381

Common causes

  • Fault occurs if the sum of the phase currents is higher than 5 % of the nominal inverter current. p. 381

If F00021 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Siemens service.

Open the manual at page 381 All CU240S error codes Manual details & download

This page summarises what the manufacturer’s manual says about F00021; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.