Trane Error Code Reference — All 44 Codes
Complete Trane error code cheat sheet. All 44 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Trane 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 "Trane error code 13" or "Trane pressure switch fault".
| Error Code | What It Means | Guide |
|---|---|---|
| Best Furnace Igniter Replacement | Universal and Brand-Specific Picks | Fix → |
| Trane 1 Flash Error Code | Causes & Fix | Fix → |
| Trane 2 Flashes Error Code | Causes & Fix | Fix → |
| Trane 3 Flash Pressure Switch Fault | Detailed Diagnosis Guide | Fix → |
| Trane 3 Flashes Error Code | Pressure Switch Fault Fix | Fix → |
| Trane 4 Flashes Error Code | Open High Limit Fix | Fix → |
| Trane 4TCC4 Mini Split Error Codes | Causes & Fix | Fix → |
| Trane 5 Flashes Error Code | Causes & Fix | Fix → |
| Trane 6 Flashes Error Code | Causes & Fix | Fix → |
| Trane 7 Flashes Error Code | Gas Valve Circuit Fault Fix | Fix → |
| Trane 8 Flashes Error Code | Causes & Fix | Fix → |
| Trane 9 Flashes Error Code | Causes & Fix | Fix → |
| Trane AC E2 Error Code | Sensor and Communication Fault Fix | Fix → |
| Trane CenTraVac Chiller Fault Codes | Common Faults Guide | Fix → |
| Trane Chiller Fault Codes | Complete Troubleshooting Guide | Fix → |
| Trane ComfortLink II Communicating Thermostat Fault Codes | What They Mean and How to Fix Them | Fix → |
| Trane ComfortLink II Error Codes | Common Faults and Fixes | Fix → |
| Trane ComfortR ER Error Code | Causes & Fix | Fix → |
| Trane Error Code 126 | Ignition Lockout Fix | Fix → |
| Trane Furnace Error Codes | Complete Flash Code Guide | Fix → |
| Trane Heat Pump 1 Flash Error Code | Causes & Fix | Fix → |
| Trane Heat Pump E2 Error Code | Outdoor Coil Sensor Fault | Fix → |
| Trane Precedent Rooftop Unit Error Codes: Complete Guide | Trane Precedent RTU error codes and fault diagnostics for commercial technicians. Flash codes, sensor faults, and step-by-step fixes. | Fix → |
| Trane Rooftop Unit Error Codes: Common Faults Guide | Complete guide to Trane RTU fault codes for Precedent, YCD, and YCC series units. Flash codes, alphanumeric faults, and technician fixes. | Fix → |
| Trane Rooftop Unit Fault 77 | High Pressure Cutout | Fix → |
| Trane S8X1 Furnace Error Codes | Flash Code Diagnostic Guide | Fix → |
| Trane TAM Air Handler Error Codes | Complete Guide | Fix → |
| Trane Tracer BAS Fault Codes | Complete Guide | Fix → |
| Trane VRF System Error Codes Guide | Complete guide to Trane VRF error codes. Covers all fault codes for Trane VRF multi-split systems with diagnostic steps and technician fixes. | Fix → |
| Trane XE80 Furnace Error Codes | Fault Code Guide | Fix → |
| Trane XL16i Error Codes | Heat Pump Fault Code Diagnostic Guide | Fix → |
| Trane XL20i Variable Speed Error Codes | Complete Guide | Fix → |
| Trane XR13 Air Conditioner Error Codes | Fault Code Diagnostic Guide | Fix → |
| Trane XR14 Heat Pump Error Codes | Fault Code Diagnostic Guide | Fix → |
| Trane XR15 Heat Pump Error Codes | Complete Guide | Fix → |
| Trane XR80 Error Codes | Flash Code Quick Reference | Fix → |
| Trane XR90 Furnace Error Codes | Fault Code Diagnostic Guide | Fix → |
| Trane XR95 Furnace Error Codes | Complete Guide | Fix → |
| Trane XV20i Error Code 79 | Causes & Fix | Fix → |
| Trane XV20i Error Code 79: Communicating Thermostat Fault Fix | Trane XV20i error code 79 means a communicating thermostat fault. Learn the causes, how to diagnose ComfortLink II wiring issues, and how to fix it fast. | Fix → |
| Trane XV20i Heat Pump Error Codes | Common Faults & Fixes | Fix → |
| Trane XV20i/XV18 Variable Speed Heat Pump Error Codes | Trane XV20i and XV18 variable speed heat pump error codes and fault diagnostics. ComfortLink II fault codes, causes, and technician fixes. | Fix → |
| Trane XV80 Furnace Error Codes | Flash Code Diagnostic Guide | Fix → |
| Trane YSC Packaged Rooftop Error Codes | Fault Code Diagnostic Guide | Fix → |