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.

• Fujitsu Mini Split E3 Error Code — Causes & Fix

  22 Apr, 2026

  Fujitsu mini-split E3 guide for communication faults, indoor/outdoor wiring, terminal checks, control boards, sensors, and service decisions.

• Haas Alarm 106 — Causes & Fix

  22 Apr, 2026

  Troubleshoot Haas alarm 106 servo fault on CNC equipment with checks for servo load, spindle drives, parameters, wiring, and when to call a controls tech.

• Haas Alarm 107 - Servo Motor Overtemp Fix

  22 Apr, 2026

  Haas Alarm 107 means servo motor overtemperature. Let the motor cool, then check overload, thermistor signal, cooling fins, lube, and axis drag.

• Hoshizaki E4 Error Code — Causes & Fix

  22 Apr, 2026

  Troubleshoot Hoshizaki E4 error code on refrigeration equipment with checks for sensors, airflow, condenser condition, controls, and parts to price first.