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Industrial Error Code Fixes

Carrier Error Code Reference — All 68 Codes

Complete Carrier error code cheat sheet. All 68 fault codes with plain-English explanations and direct links to fix guides.

Use this page when your Carrier 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 "Carrier error code 13" or "Carrier pressure switch fault".

Error Code What It Means Guide
Best Furnace Igniter Replacement Universal and Brand-Specific Picks Fix →
Carrier 11 Error Code Causes & Fix Fix →
Carrier 12 Error Code Causes & Fix Fix →
Carrier 13 Error Code Limit Switch Lockout Fix Fix →
Carrier 13 Soft Lockout What's Different from Hard Lockout Fix →
Carrier 14 Error Code Causes & Fix Fix →
Carrier 21 Error Code Gas Heating Lockout Fix Fix →
Carrier 22 Error Code Causes & Fix Fix →
Carrier 23 Error Code Draft Safeguard Switch Fault Fix →
Carrier 24 Error Code Causes & Fix Fix →
Carrier 24ACC Air Conditioner Error Codes Fault Code Diagnostic Guide Fix →
Carrier 24ANA Heat Pump Error Codes Performance Series Diagnostic Guide Fix →
Carrier 25 Error Code Causes & Fix Fix →
Carrier 30XA Commercial Chiller Fault Codes Common Faults and Fixes Fix →
Carrier 31 Error Code Pressure Switch Fix Fix →
Carrier 32 Error Code Causes & Fix Fix →
Carrier 33 Error Code Causes & Fix Fix →
Carrier 34 Error Code Ignition Proving Failure Fix Fix →
Carrier 40MAQ / 40MVC Mini Split Error Codes Causes & Fix Fix →
Carrier 41 Error Code Blower Motor Fault Fix Fix →
Carrier 42 Error Code Causes & Fix Fix →
Carrier 43 Error Code Rollout Switch Open Fix Fix →
Carrier 44 Error Code Causes & Fix Fix →
Carrier 45 Error Code Causes & Fix Fix →
Carrier 46 Error Code Check IFC: Board Self-Diagnosis Fault Fix →
Carrier 48 Error Code Induced Draft Motor Lockout Fix →
Carrier 48XLC Packaged Unit Error Codes Fault Code Diagnostic Guide Fix →
Carrier 52 Error Code Causes & Fix Fix →
Carrier 54 Error Code Soft Lockout: Low Pressure Switch Open Fix →
Carrier 58CVA Furnace Error Codes Fault Code Diagnostic Guide Fix →
Carrier 58MVB Furnace Error Codes Variable-Speed Furnace Fault Guide Fix →
Carrier 58UX Furnace Error Codes Flash Code Diagnostic Guide Fix →
Carrier AC E3 Error Code: IPM Module Fault Diagnosis and Fix Carrier E3 error code means an IPM module fault on your AC or heat pump. Learn what causes Intelligent Power Module failures and when to replace the board. Fix →
Carrier AquaSnap Chiller Fault Codes 30RB/30RQ Guide Fix →
Carrier Chiller Fault Codes Complete Troubleshooting Guide Fix →
Carrier E3 Error Code Causes & Fix Fix →
Carrier Error Code 24 Secondary Voltage Fuse Open Fix →
Carrier Error Code 51 Control Fault (Secondary) Fix →
Carrier Error Code 56 IFC Fault (Induced Draft Motor) Fix →
Carrier Error Code 58 Causes & Fix Fix →
Carrier Error Code 61 Rollout Switch Lockout Fix →
Carrier Error Code 65 Inducer Motor Fault Fix →
Carrier Error Code 66 Pressure Switch Fault Fix →
Carrier Furnace E1 Error Code Causes & Fix Fix →
Carrier Furnace Error Code 13 Limit Circuit Lockout Fix Fix →
Carrier Furnace Error Code 31 Pressure Switch Open Fix Fix →
Carrier Furnace Error Code 33 Flame Rollout & High Limit Switch Fix Fix →
Carrier Furnace Error Codes Complete Guide Fix →
Carrier Geothermal Heat Pump Error Codes Guide Complete guide to Carrier geothermal heat pump error codes. Covers Infinity and Performance series fault codes, diagnostic steps, and technician fixes. Fix →
Carrier Greenspeed Heat Pump Error Codes: Complete Guide Carrier Greenspeed variable speed heat pump error codes and fault diagnostics. Infinity system fault codes, causes, and technician fixes. Fix →
Carrier Heat Pump E1 Error Code Causes & Fix Fix →
Carrier Heat Pump E4 Error Code Causes & Fix Fix →
Carrier Heat Pump E5 Error Code Defrost Fault: Causes & Fix Fix →
Carrier Heat Pump E6 Error Code Outdoor Temp Sensor Fault Fix →
Carrier Infinity Error 178 What It Means and How to Fix It Fix →
Carrier Infinity Error Code 179 What It Means and How to Fix It Fix →
Carrier Infinity Series 24ACC6 Error Codes Fault Code Diagnostic Guide Fix →
Carrier Infinity System Communication Error 168 Wiring & Board Fix Fix →
Carrier Infinity System Communication Error Codes Complete Guide Fix →
Carrier Infinity XC21 Error Codes Most Common Faults and Fixes Fix →
Carrier Infinity Zoning System Error Codes Complete Guide Fix →
Carrier Mini-Split E4 Error Code Compressor Discharge Temperature Fix Fix →
Carrier Mini-Split F0 Error Code Low Refrigerant / Leakage Detection Fix Fix →
Carrier Mini-Split P4 Error Code Inverter Module Overtemperature Fix Fix →
Carrier Rooftop Unit Error Codes: Common Faults Guide Complete guide to Carrier RTU error codes. Covers flash codes, fault descriptions, and technician-level fixes for 48 and 50 Series commercial rooftop units. Fix →
Carrier VRF System Error Codes Guide Complete guide to Carrier VRF (Variable Refrigerant Flow) system error codes. Covers all fault codes for Carrier i-Vu and CCN-based VRF systems. Fix →
Carrier WeatherMaker Rooftop Unit Error Codes: Complete Guide Carrier WeatherMaker RTU error codes for 48 and 50 Series commercial rooftop units. Flash codes, fault descriptions, and technician-level fixes. Fix →
Carrier Zone Controller Error Codes Complete Guide Fix →
View all Carrier guides →