Trane XR80 furnace provides a LED on its integrated furnace control for quick diagnostic. Here is its diagnostic code:
| LED Flash | Error |
|---|---|
| Flashing Slow | Normal No Call for Heat |
| Flashing Fast | Normal Call for Heat |
| Continuous On | Replace Control |
| Continuous Off | Check Power |
| 2 Flashes | External Lockout (Retries or Recycles Exceeded) |
| 3 Flashes | Pressure Switch Error |
| 4 Flashes | Open High Limit Device |
| 5 Flashes | Flame Sensed when NO flame should be present |
| 6 Flashes | 115 VAC power reversed polarity or poor grounding |
| 7 Flashes | Gas Valve circuit Error |
| 8 Flashes | Low Frame sense Signal |
| 9 Flashes | Check Ignitor |