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Industrial Error Code Fixes

Lennox Error Code Reference — All 41 Codes

Complete Lennox error code cheat sheet. All 41 fault codes with plain-English explanations and direct links to fix guides.

Use this page when your Lennox furnace, air conditioner, heat pump, or mini split is flashing a fault. Start with the exact code, then open the fix guide to diagnose airflow, ignition, sensor, pressure switch, board, or communication problems before you order parts or book a service call.

Tip: search the exact brand, model, and code together, for example "Lennox error code 13" or "Lennox pressure switch fault".

Error Code What It Means Guide
Best Furnace Igniter Replacement Universal and Brand-Specific Picks Fix →
Lennox 103 Error Code Causes & Fix Fix →
Lennox 204 Error Code Causes & Fix Fix →
Lennox EL296V Error Codes Variable-Speed Furnace Diagnostic Guide Fix →
Lennox Elite Series Furnace Error Codes Fault Code Diagnostic Guide Fix →
Lennox Error Code 111 Causes & Fix Fix →
Lennox Error Code 114 Causes & Fix Fix →
Lennox Error Code 125 Causes & Fix Fix →
Lennox Error Code 223 Causes & Fix Fix →
Lennox Error Code 225 Causes & Fix Fix →
Lennox Error Code 231 Causes & Fix Fix →
Lennox Error Code 292 Ignition Failure Fix Fix →
Lennox Error Code 327 Causes & Fix Fix →
Lennox Error Code 332 Causes & Fix Fix →
Lennox Error Code 411 Ignition Proving Fault Fix Fix →
Lennox Error Code 412 Inducer Motor Fault (Detailed Guide) Fix →
Lennox Error Code 412 Limit Switch Fault Fix Fix →
Lennox Error Code 414 Gas Valve Circuit Fault Fix Fix →
Lennox Error Code 414 Rollout Causes & Fix Fix →
Lennox Error Code 432 Causes & Fix Fix →
Lennox Error Code 434 Outdoor Unit Communication Fault Fix →
Lennox Error Code 441 Limit Device Fault Fix →
Lennox Error Code 540 Causes & Fix Fix →
Lennox Error Code 540 Communicating System Fault (Detailed Guide) Fix →
Lennox Furnace Error Codes Complete Reference Guide Fix →
Lennox G60UHV Furnace Error Codes Flash Code Diagnostic Guide Fix →
Lennox Harmony III Zoning System Error Codes Complete Guide Fix →
Lennox Healthy Climate Error Codes Complete Guide Fix →
Lennox iComfort EFO Error Code Excessive Flame Out and Common iComfort Faults Fix →
Lennox iComfort Error Code 225 Communication Fault Fix Guide Fix →
Lennox iComfort Error Code 31 Pressure Switch Fault Diagnosis and Fix Fix →
Lennox iHarmony Zoning System Error Codes Troubleshooting Guide Fix →
Lennox Mini Split Error Code E1 Causes & Fix Fix →
Lennox ResolvePlus Rooftop Unit Error Codes: Complete Guide Lennox ResolvePlus RTU error codes and fault diagnostics. Covers flash codes, communicating system faults, and technician-level troubleshooting. Fix →
Lennox Rooftop Unit Error Codes: Technician Guide Complete Lennox RTU error code guide for LGH, LCH, and Strategos series. Flash codes, alphanumeric faults, and technician fixes for commercial rooftop units. Fix →
Lennox SL280UHV Error Codes Complete Fault Code Diagnostic Guide Fix →
Lennox SLP98V Error Codes Variable-Speed Furnace Fault Guide Fix →
Lennox XC16 Air Conditioner Error Codes Fault Code Diagnostic Guide Fix →
Lennox XC21 Error Codes Diagnostic Guide and Fixes Fix →
Lennox XP20 Heat Pump Error Codes Full iComfort Fault Reference Fix →
Lennox XP21 Heat Pump Error Codes iComfort Fault Code Guide Fix →
View all Lennox guides →