These error codes apply to Trane gas furnaces only. Error codes for other brands will probably be totally different. The number of possible codes depends on which generation furnace you have. Typically, the newer the furnace, the more error codes the control will be able to show.
The following tables apply to integrated furnace controls; these boards control all functions of the furnaces, as opposed to igntion-only controls.
Common Integrated Furnace Controls (IFC) :
| |
| Flashing Slow | Normal - No call for Heat from thermostat |
| Flashing Fast | Normal - Call for Heat from thermostat |
| Continuous ON | Control Board Bad - needs replaced |
| Continuous OFF | Check Power |
| 2 Flashes | System Lockout (Retries or Recycles exceeded) |
| 3 Flashes | Vent Pressure Switch Error |
| 4 Flashes | Open High Temperature Limit Device |
| 5 Flashes | Flame sensed when no flame should be present |
| Flashing Slow | Normal - No call for Heat from thermostat |
| Flashing Fast | Normal - Call for Heat from thermostat |
| Continuous ON | Control Board Bad - needs replaced |
| Continuous OFF | Check Power |
| 2 Flashes | System Lockout (Retries or Recycles exceeded) |
| 3 Flashes | Vent Pressure Switch Error |
| 4 Flashes | Open High Temperature Limit Device |
| 5 Flashes | Flame sensed when no flame should be present |
| 6 Flashes | 115 Volt AC power reversed or Poor Grounding |
| 7 Flashes | Gas valve circuit error |
| 8 Flashes | Low flame sense signal |
| Flashing Slow | Normal - No call for Heat from thermostat |
| Flashing Fast | Normal - Call for Heat from thermostat |
| Continuous ON | Control Board Bad - needs replaced |
| Continuous OFF | Check Power |
| 2 Flashes | System Lockout (Retries or Recycles exceeded) |
| 3 Flashes | Vent Pressure Switch Error |
| 4 Flashes | Open High Temperature Limit Device |
| 5 Flashes | Flame sensed when no flame should be present |
| 6 Flashes | 115 Volt AC power reversed or Poor Grounding |
| 7 Flashes | Gas valve circuit error |
| 8 Flashes | Low flame sense signal |
| 9 Flashes | Check ignitor circuit and line "N" to 24 VAC Common voltage ( < 2 volts) (possible grounding problem) |
Ignition Only Control, used in older model furnaces.
| Flashing | Igniton Lockout (Retries exceeded) |
| Continuous ON | Control Bad - needs replaced |
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