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.

• Lennox Error Code 125 — Causes & Fix

  22 Apr, 2026

  What Lennox error code 125 means, why the pressure switch stays open at the end of heat speed, and how to fix it.

• Lennox Error Code 231 — Causes & Fix

  22 Apr, 2026

  What Lennox error code 231 means, why the rollout switch trips, and how to reset and repair it safely.

• Lennox Error Code 332 — Causes & Fix

  22 Apr, 2026

  What Lennox error code 332 means, why the limit device opens, and how to diagnose and fix restricted airflow.

• Lenze VFD Fault CE — Causes & Fix

  22 Apr, 2026

  What Lenze VFD fault code CE means, why communication errors occur, and how to restore the fieldbus or serial link.