Trane Furnace Error Codes

Complete LED flash code directory for Trane furnaces

Furnace Not Working?

About Trane Error Codes

Trane furnaces use an LED flash code system on the control board to indicate status and errors. Count the number of flashes between pauses to identify the error code.

Slow Flash

Normal operation, call for heat

2 Flashes

Pressure switch stuck closed

3 Flashes

Pressure switch stuck open

4 Flashes

Open high limit or auxiliary limit

5 Flashes

Flame detected out of sequence

6 Flashes

System lockout - multiple flame failures