Siemens MICROMASTER 420 Error Codes

46 codes from pages 70–73 of the manual

This is the list of fault, warning codes the Siemens manual gives for the MICROMASTER 420 Siemens MICROMASTER 420 inverter. Find your code below and open it for what the manual says about its causes and what to do.

Fault codes from p. 70

CodeWhat it meansPage
F0001 Overcurrent p. 70
F0002 Overvoltage p. 70
F0003 Undervoltage p. 70
F0004 Inverter Over-temperature p. 70
F0005 Inverter î² p. 70
F0011 Motor Over-temperature î² p. 70
F0041 Stator resistance measurement failure p. 70
F0051 Parameter EEPROM Fault p. 71
F0052 Powerstack Fault p. 71
F0060 Asic Timeout p. 71
F0070 Communications board setpoint error p. 71
F0071 No Data for USS (RS232 link) during Telegramm Off Time p. 71
F0072 No Data from USS (RS485 link) during Telegram Off Time p. 71
F0080 Analogue input - lost input signal p. 71
F0085 External Fault p. 71
F0101 Stack Overflow p. 71
F0221 PI Feedback below minimum value p. 71
F0222 PI Feedback above maximum value p. 71
F0450 BIST Tests Failure (Service mode only) p. 71

Warning codes from p. 72

CodeWhat it meansPage
A0501 Current Limit p. 72
A0502 Overvoltage limit p. 72
A0503 Undervoltage Limit p. 72
A0504 Inverter Over-temperature p. 72
A0505 Inverter ï† p. 72
A0506 Inverter Duty Cycle p. 72
A0511 Motor Over-temperature ï† p. 72
A0541 Motor Data Identification Active p. 72
A0600 RTOS Overrun Warning p. 72
A0700 CB warning 1 p. 72
A0701 CB warning 2 p. 72
A0702 CB warning 3 p. 72
A0703 CB warning 4 p. 72
A0704 CB warning 5 p. 72
A0705 CB warning 6 p. 72
A0706 CB warning 7 p. 73
A0707 CB warning 8 p. 73
A0708 CB warning 9 p. 73
A0709 CB warning 10 p. 73
A0710 CB communication error p. 73
A0711 CB configuration error p. 73
A0910 Vdc-max controller deactivated p. 73
A0911 Vdc-max controller active p. 73
A0912 Vdc-min controller active p. 73
A0920 ADC parameters not set properly p. 73
A0921 DAC parameters not set properly p. 73
A0922 No load applied to inverter p. 73

Codes and descriptions are taken from the manufacturer’s manual; page numbers link to the PDF. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.