Siemens CU240B/E-2 Error F30903: Power unit: I2C bus error occurred

Control unit · taken from the manufacturer’s manual, pages cited

Alarm codeF30903

An I2C bus communication error occurred with an EEPROM or A/D converter, possibly indicating software or hardware failure. The manual lists no action for this code.

Model
Siemens CU240B/E-2
Display shows
Power unit: I2C bus error occurred (F30903)
Type
Alarm code
Source
Manual p. 731

What F30903 means

Power unit: I2C bus error occurred p. 731

Common causes

  • Communications error with an EEPROM or A/D converter. p. 731
  • Fault value (r0949, interpret hexadecimal): 80000000 hex: - internal software error. 00000001 hex ... 0000FFFF hex: - module fault. p. 731

If F30903 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 731 All CU240B/E-2 error codes Manual details & download

This page summarises what the manufacturer’s manual says about F30903; 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.