Siemens G120C Error 20: Auxiliary unit fault

Siemens G120C drive · taken from the manufacturer’s manual, pages cited

Fault code20

The monitoring of an auxiliary unit, such as incoming transformer or cooling unit, has detected an illegal state on the Siemens G120C drive. The manual's first action is: “Determine the exact cause of the fault and check the relevant device.”

Model
Siemens G120C
Display shows
Auxiliary unit fault (20)
Type
Fault code
Source
Manual p. 655

What 20 means

Auxiliary unit fault p. 655

Common causes

  • The monitoring of an auxiliary unit (incoming transformer, cooling unit ...) has detected an illegal state. p. 655

What to do

  1. Determine the exact cause of the fault and check the relevant device. p. 655

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

If 20 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 655 All G120C error codes Manual details & download

This page summarises what the manufacturer’s manual says about 20; 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.