HVACopediaAirQuest furnace error codes
5 codes with causes and test steps.
| Code | Meaning | Severity |
|---|---|---|
| 13 | Limit circuit lockout | High |
| 14 | Ignition lockout | High |
| 31 | Pressure switch did not close or reopened | High |
| 33 | Limit circuit fault | High |
| 34 | Ignition proving failure | High |
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.