Siemens G120C Error F30903: Power unit: I2C bus error occurred – Meaning, Causes & Fix

Fault codeF30903

The power unit encountered an I2C bus error communicating with an EEPROM or analog/digital converter, indicating a module fault. The manual's first action is: “- internal software error.”

Model: Siemens G120C
Display shows: Power unit: I2C bus error occurred (F30903)
Type: Fault code
Source: Manual p. 750

Meaning
Common causes
What to do
Still not solved
Source

What F30903 means

Power unit: I2C bus error occurred p. 750

Common causes

Communications error with an EEPROM or an analog/digital converter. p. 750
Fault value (r0949, interpret hexadecimal): 80000000 hex: p. 750
00000001 hex ... 0000FFFF hex: - module fault. p. 750

What to do

- internal software error. p. 750

Before you service the product, read the safety instructions in the manual p. 4.

If F30903 is still not resolved

contact service / dealer p. 4
“Warning concept This Manual contains information which you must observe to ensure your own personal safety as well as to avoid material damage.”
contact service / dealer p. 12
“WARNING Danger to life if the safety instructions and residual risks are not observed”

Open the manual at page 750 All G120C 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.