The Industrial Error Code Library
Technician-written diagnostic guides for HVAC, CNC, VFD, refrigeration, boilers, and commercial equipment. Real OEM part numbers, voltage and resistance ranges, step-by-step fix trees. No paywall, no email gate.
Most Common Fixes
-
Furnace Error Code Lookup Tool: All Brands
Master furnace error code lookup guide covering Carrier, Goodman, Lennox, Trane, York, Rheem, Bryant, Heil, Amana, Coleman, and more.
-
Ice Machine Error Code Lookup: All Brands
Master ice machine error code lookup guide covering Hoshizaki, Manitowoc, Scotsman, Ice-O-Matic, Follett, and more.
-
Industrial Equipment Error Code Database: Master Reference
Master reference hub for industrial equipment error codes covering HVAC, refrigeration, VFDs, CNC controls, boilers, pumps, compressors, and commercial kitchen equipment.
-
Mini Split Error Code Lookup: All Brands
Master mini split error code lookup guide covering Daikin, Mitsubishi, Fujitsu, Gree, LG, Bosch, Cooper & Hunter, and more.
-
VFD Fault Code Lookup: All Brands
Master VFD fault code lookup guide covering ABB, Danfoss, Siemens, Schneider, Mitsubishi, Yaskawa, Allen-Bradley, and more.
-
Hoshizaki Ice Machine E1 Error Code — Water Inlet Fix
Hoshizaki E1 error code means the ice machine has a water inlet problem. This guide covers float switch, inlet valve, and water supply fixes for Hoshizaki commercial ice makers.
-
Fanuc Alarm 300 — APC Alarm Fix (Absolute Encoder)
Fanuc Alarm 300 is an APC (Absolute Pulse Coder) alarm on the absolute encoder. This guide covers battery replacement, encoder initialization, and board-level diagnosis.
-
Mitsubishi Mini Split E6 Error Code Fix
Mitsubishi mini split E6 error code means a communication failure between the indoor and outdoor units. Here's how to diagnose wiring, boards, and connection issues.
-
Carrier 13 Error Code — Limit Switch Lockout Fix
Carrier error code 13 means the limit switch tripped due to overheating. This guide covers every cause and fix — from clogged filters to cracked heat exchangers.
-
Carrier 21 Error Code — Gas Heating Lockout Fix
Carrier error code 21 signals a gas heating lockout — the furnace failed to ignite after multiple attempts. Learn the exact steps to diagnose and reset it.
-
Carrier 34 Error Code — Ignition Proving Failure Fix
Carrier error code 34 means ignition proving failure — the furnace tried to light but couldn't confirm a flame. Here's how to diagnose and fix it fast.
Most popular fixes this week
Auto-updated from real reader traffic, refreshed weekly.
- 1 Siemens VFD Fault Codes — SINAMICS G120, V20, S120 Guide
- 2 CNC Machine Error Codes: Complete Troubleshooting Guide
- 3 Hoshizaki E7 Error Code — Causes & Fix
- 4 Mitsubishi FR-D700 VFD Fault Codes — Complete Diagnostic Reference
- 5 Yaskawa Sigma-7 SGD7S Servo Drive Alarm Codes — Diagnosis & Fix
- 6 CNC Alarm Reset Guide: How to Clear Alarms Safely
All Fix Guides
-
Siemens G120 F01650 - Causes & Fix
Siemens G120 F01650 fault indicates a safety parameterization error. Learn how to diagnose and clear this Safety Integrated fault.
-
Siemens G120 F01625 - Causes & Fix
Siemens G120 F01625 (sign-of-life error in safety data) means the Safety Integrated function detected a communication fault. Causes, steps, parts.
-
Siemens G120 F01600 - Causes & Fix
Siemens G120 F01600 means Safety Integrated STOP A initiated. Learn the real causes, diagnostic steps, and parts for this safety fault.
-
Siemens G120 A01590 Fault Code - Causes & Fix
A01590 is not a standard Siemens G120 code. Learn how to read the actual fault buffer, troubleshoot unknown alarms, and clear errors.