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.

• Lochinvar Boiler Error Code E04 — Causes & Fix

  22 Apr, 2026

  What Lochinvar boiler error code E04 means, why the high limit trips, and how to diagnose and reset safely.

• Manitowoc Ice Machine Error Code 5 — Causes & Fix

  22 Apr, 2026

  Troubleshoot Manitowoc Error Code 5 on refrigeration equipment with checks for sensors, airflow, condenser condition, controls, and parts to price first.

• Mazak Alarm 100 Spindle Alarm — Causes & Fix

  22 Apr, 2026

  What Mazak alarm 100 means, why a spindle alarm occurs, and how to diagnose and fix the spindle drive system.

• Midea Mini Split E1 Error Code — Causes & Fix

  22 Apr, 2026

  What Midea mini split error code E1 means, why high pressure protection trips, and how to diagnose and fix it.