HVAC, Appliance, CNC, and VFD Error Code Repair Guides

Browse repair guides for HVAC, appliances, refrigeration, CNC alarms, VFD faults, generators, boilers, water heaters, and commercial equipment.

• Siemens Sinumerik Alarm 25201 — Causes & Fix

  22 Apr, 2026

  What Siemens Sinumerik alarm 25201 means, why drive overcurrent trips, and how to fix it.

• True Refrigeration E2 Error Code — Causes & Fix

  22 Apr, 2026

  Troubleshoot True Refrigeration E2 on refrigeration equipment with checks for sensors, airflow, condenser condition, controls, and parts to price first.

• Yaskawa VFD Fault LF — Causes & Fix

  22 Apr, 2026

  What Yaskawa VFD fault LF means, why output phase loss trips the drive, and how to fix it.

• Yaskawa VFD Fault PF — Causes & Fix

  22 Apr, 2026

  What Yaskawa VFD fault PF means, why input phase loss trips the drive, and how to fix it.