Siemens MICROMASTER 420 Error F0450: BIST Tests Failure (Service mode only)

Siemens MICROMASTER 420 inverter · taken from the manufacturer’s manual, pages cited

Fault codeF0450

BIST Tests Failure (Service mode only) indicates internal tests have failed. The manual's first action is: “1. Inverter may run but certain actions will not function correctly 2. Replace inverter”

Model
Siemens MICROMASTER 420
Display shows
BIST Tests Failure (Service mode only) (F0450)
Type
Fault code
Source
Manual p. 71

What F0450 means

BIST Tests Failure (Service mode only) p. 71

Common causes

  • 1 Some of the power section tests have failed 2 Some of the control board tests have failed 4 Some of the functional tests have failed 8 Some of the IO module tests have failed 16 The Internal RAM has failed its check on power-up p. 71

Safety warnings — read before you start

  • DANGERDANGER. indicates an immiently hazardous situation which, if not avoided, will result in death or serious injury. p. 6
  • WARNINGWARNING. This equipment contains dangerous voltages and controls potentially dangerous rotating mechanical parts. p. 7

What to do

  1. 1. Inverter may run but certain actions will not function correctly 2. Replace inverter p. 71

If F0450 is still not resolved

  • Replace inverter p. 71
    “Replace inverter”
Open the manual at page 71 All MICROMASTER 420 error codes Manual details & download

This page summarises what the manufacturer’s manual says about F0450; 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.