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.

• Navien Error Code E013 — Causes & Fix

  22 Apr, 2026

  Diagnose Navien Error Code E013 - Causes & Fix: likely causes to check, measurements to verify, and repair decisions before parts replacement.

• Noritz Error Code 29 — Causes & Fix

  22 Apr, 2026

  Diagnose Noritz Error Code 29 - Causes & Fix: likely causes to check, measurements to verify, and repair decisions before parts replacement.

• Okuma CNC Alarm 1600 — Communication Error Causes & Fix

  22 Apr, 2026

  Diagnose Okuma CNC Alarm 1600 - Communication Error Causes & Fix: what triggers the alarm, checks to run, and repair decisions before clearing the machine.

• Omron VFD Fault E07 — Causes & Fix

  22 Apr, 2026

  Diagnose Omron VFD Fault E07 - Causes & Fix: likely causes to check, measurements to verify, and repair decisions before parts replacement.