Carrier Error Code Reference — All 41 Codes
Complete Carrier error code cheat sheet. All 41 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 | Often a cheap fix? | Guide |
|---|---|---|---|
| Best Furnace Igniter Replacement | Universal and Brand-Specific Picks | — | Fix → |
| Carrier 11 Error Code | Causes & Fix | — | Fix → |
| Carrier 13 Error Code | Limit Switch Lockout Fix | — | Fix → |
| Carrier 21 Error Code | Gas Heating Lockout Fix | — | 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 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 34 Error Code | Ignition Proving Failure Fix | — | Fix → |
| Carrier 40MAQ / 40MVC Mini Split Error Codes | Causes & Fix | — | Fix → |
| Carrier 42 Error Code | Causes & Fix | — | 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 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 AquaSnap Fault Codes: 30RB/30RQ Alarm List & Fixes | Real Carrier AquaSnap 30RB/30RQ chiller alarm codes from the Pro-Dialog manual: TH, Pr, P and compressor faults, likely causes, and how to fix each. | — | Fix → |
| Carrier Chiller Fault Codes | Complete Troubleshooting Guide | — | Fix → |
| Carrier Error Code 24 | Secondary Voltage Fuse Open | — | Fix → |
| Carrier Error Code 27 | Causes & Fix | — | Fix → |
| Carrier Error Code 28 | 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 Codes | Complete Guide | — | Fix → |
| Carrier Furnace Igniter Not Working | Causes & Fix | — | 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 A3 | Defrost Fault Fix | — | 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 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 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 Error Codes (38VM/40VM) Fault Code Guide | Real Carrier VRF fault codes for 38VM outdoor, 40VM indoor and MDC units. Decode 0E, 0H, 0P, SE and E-series errors with likely causes and fixes. | — | 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 WeatherMaker RTU Error Code 23 | Fix | — | Fix → |
| Carrier Zone Controller Error Codes | Complete Guide | — | Fix → |