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.

• LG Mini-Split CH21 Error Code — Outdoor Unit High Pressure

  22 Apr, 2026

  LG mini-split CH21 error code means high pressure protection on the outdoor unit. Learn the causes, how to diagnose, and how to fix LG CH21.

• LG Mini-Split CH26 Error Code — CT Sensor Fault

  22 Apr, 2026

  LG mini-split CH26 error code means a current transformer (CT) sensor fault on the outdoor unit. Learn causes, diagnostic steps, and how to fix LG CH26.

• Mazak Alarm 700 — MPC Alarm

  22 Apr, 2026

  Mazak alarm 700 guide for MPC motion-control faults, related servo alarms, cabinet cooling, board connections, batteries, and hardware calls.

• Mitsubishi E7 Error Code — Refrigerant Cycle Fault

  22 Apr, 2026

  Mitsubishi mini-split Error Code E7 indicates a refrigerant cycle abnormality. Learn causes, diagnostic steps, and fixes for Mitsubishi E7.