Posts

All the articles I've posted.

• Navien E030 Error Code - Causes & Fix

  31 May, 2026

  E030 means exhaust overheat on your Navien tankless water heater. Most often caused by blocked venting or a clogged inlet filter.

• Siemens G120 F01662 - Causes & Fix

  31 May, 2026

  F01662 means internal communication error inside the drive. Most often fixed by power cycling or replacing the control unit.

• Siemens G120 F01659 - Causes & Fix

  31 May, 2026

  F01659 means the drive rejected a safety parameter write. Most likely fix: enter the correct Safety Integrated password or reset the safety state.

• Siemens G120 F01650 - Causes & Fix

  31 May, 2026

  F01650 means a safety parameter fault. Most often the Safety Integrated acceptance test is incomplete or safety wiring has a problem.

• Siemens G120 F01625 - Causes & Fix

  31 May, 2026

  F01625 means a sign-of-life error in safety data on your G120 drive. Most often caused by EMC interference or wiring issues.

• Siemens G120 F01600 - Causes & Fix

  31 May, 2026

  F01600 means Safety Integrated STOP A initiated on your Siemens G120 VFD. Check STO inputs, read fault value r0949, then cycle power.

• Siemens G120 A01590 Alarm - Causes & Fix

  31 May, 2026

  A01590 means your motor maintenance interval has expired on the G120 VFD. Reset parameter p0651 after performing scheduled motor service.

• Siemens G120 F01250 Fault - Causes & Fix

  31 May, 2026

  F01250 is not a verified Siemens G120 fault code. Confirm the exact code on your drive display, then consult the fault list or call support.

• Siemens G120 F01205 - Causes & Fix

  31 May, 2026

  F01205 means the control unit's CPU ran out of processing time. Power-cycle the drive. If it returns, replace the control unit.

• Siemens G120 F01122 - Causes & Fix

  31 May, 2026

  F01122 (A01122) means frequency at the measuring probe input is too high. Check probe wiring, scaling, and parameters before replacing anything.

• Siemens G120 F01105 - Causes & Fix

  31 May, 2026

  F01105 means the Control Unit has insufficient memory. Most often fixed by reloading parameters or replacing the CU if hardware fails.

• Siemens G120 F01044 - Causes & Fix

  31 May, 2026

  F01044 means the Control Unit cannot load descriptive data from memory. Most common fix: power cycle, reseat memory card, or replace CU.

• Siemens G120 VFD F01040 - Causes & Fix

  31 May, 2026

  F01040 means the G120 drive changed a parameter and needs you to save settings (p0971) then power-cycle the Control Unit to clear.

• Siemens G120 F01034 - Causes & Fix

  31 May, 2026

  F01034 means parameter recalculation failed after a reference value change. Most likely fix: correct incompatible parameters or clear buffer memory.

• Siemens G120 F01033 - Causes & Fix

  31 May, 2026

  F01033 means a reference parameter for unit conversion is invalid (often 0.0). Fix by correcting the scaling parameter in your drive setup.

• Siemens G120 A01028 Fault - Causes & Fix

  31 May, 2026

  A01028 means the drive's saved configuration was made for a different module type. Save parameters with p0971=1 or reload the correct project.

• Siemens F01018 - Causes & Fix

  31 May, 2026

  F01018 means the G120 drive's power-up was interrupted multiple times and it reverted to factory settings. Fix by checking supply power stability first.

• Siemens G120 F01001 - Causes & Fix

  31 May, 2026

  F01001 means a floating-point software exception in the G120 drive. Power-cycle completely, then check firmware and control-unit health.

• Siemens G120 F01000 - Causes & Fix

  31 May, 2026

  F01000 signals an internal software error in the Siemens G120 VFD control unit. Most cases resolve with a full power-cycle reset.

• ABB ACS550 EFB3 Fault - Causes & Fix

  31 May, 2026

  EFB3 is a reserved fieldbus fault on the ABB ACS550 VFD. The most likely fix is checking communication wiring and protocol settings.

• ABB ACS550 EFB 2 Fault - Causes & Fix

  31 May, 2026

  EFB 2 is a reserved communication fault code on the ACS550 drive. Most often caused by wrong control setup or fieldbus wiring issues.

• ABB ACS550 EFB1 Fault Code - Causes & Fix

  31 May, 2026

  EFB1 on the ACS550 is a protocol-dependent embedded fieldbus fault. Most often caused by master timeout or bad fieldbus wiring.

• ABB ACS550 AI1 LOSS - Causes & Fix

  31 May, 2026

  AI1 LOSS means analog input 1 signal is missing or below the configured threshold. Check wiring and field device before adjusting parameters.

• ABB ACS580 FF63 Fault - STO Diagnostics Failure Fix

  31 May, 2026

  FF63 means STO diagnostics failure on your ABB ACS580 VFD. Reboot the control unit via parameter 96.08 or power cycle the drive.