HeatingCodesTrane furnace blinking light (flash) codes
Trane and American Standard furnaces with this control report faults with an LED on the Integrated Furnace Control (IFC). The number of flashes between pauses is the code.
What this table coversCodes from Trane installer's guide 18-CH49D1-1 for the Integrated Furnace Control (IFC). Trane and American Standard furnaces with other boards can use different tables; check the wiring-diagram label inside your furnace.
How to read the display
Count the flashes in one group before the pause. A slow flash with no call for heat is normal. A fast flash during a call for heat is also normal.
A continuously lit LED means Trane says to replace the IFC, and a continuously dark LED means to check power.
Because the control is polarity sensitive, the hot leg of the 115 VAC supply must connect to the black field lead. A 6-flash code points at reversed polarity, poor grounding or low system voltage.
Trane code table
| Code | Meaning | What the document says |
|---|---|---|
| Slow flash | Normal: no call for heat | |
| Fast flash | Normal: call for heat | |
| Continuous on | Replace the IFC | |
| Continuous off | Check power | |
| 2 flashes | System lockout (retries or recycles exceeded) | |
| 3 flashes | Draft pressure error | Possible problems: a venting problem, a pressure switch problem or an inducer problem. Full explanation |
| 4 flashes | Open temperature limit circuit | Full explanation |
| 5 flashes | Flame sensed when no flame should be present | |
| 6 flashes | 115 volt AC power reversed, poor grounding, or system voltage too low | |
| 7 flashes | Gas valve circuit error | |
| 8 flashes | Low flame sense signal | Full explanation |
| 9 flashes | Check the ignitor circuit and the line N to 24 VAC common voltage (2 volts or less) | Trane notes a possible grounding problem. |
Source: Trane 18-CH49D1-1, "SiNi - IFC Error Codes" table (04/09).
Detailed explanations
- Trane furnace blinking 4 times: open temperature limit circuit
- Trane furnace blinking 3 times: draft pressure error
- Trane furnace blinking 8 times: low flame sense signal
SafetyThese tables describe what the manufacturer documents say. Gas, combustion, refrigerant and line-voltage repairs are for licensed professionals. If you smell gas, leave the building and call your gas utility or 911. Safety disclaimer.
Sources
- Installer's Guide 18-CH49D1-1: SiNi Igniter Assembly IGN00117 (includes the Integrated Furnace Control error flash codes) (Trane) Covers: Trane and American Standard furnaces using the Integrated Furnace Control (IFC) covered by this installer guide (dated 04/09). Newer boards can differ; check the wiring-diagram label inside your furnace.