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 → |