Siemens CU240S Error A00503: UnderVoltage Limit

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

Fault codeA00503

UnderVoltage Limit occurs when main supply fails, causing DC-link voltage to fall below specified limits. The manual lists no action for this code.

Model
Siemens CU240S
Display shows
UnderVoltage Limit (A00503)
Type
Fault code
Source
Manual p. 391

What A00503 means

UnderVoltage Limit p. 391

Common causes

  • Main supply failed p. 391
  • Main supply and consequently DC-link voltage (r0026) below specified limit. p. 391
  • Check main supply voltage. p. 391

If A00503 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 391 All CU240S error codes Manual details & download

This page summarises what the manufacturer’s manual says about A00503; 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.