Error code reference

Trane Furnace Error Code 6 Flash

Line polarity fault (voltage reverse polarity), ground fault (proper earth ground not detected), igniter fault (igniter circuit open or shorted), triac fault (voltage error sensed), or AC voltage too high.

SourceTrane XC80 Furnace - Service Manual: Variable Speed 2-Stagep. 30, 44-45

Trane codes Trane furnace codes

Diagnostic procedure

The full 6 Flash procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Scroll User Interface to view Last 4 Faults; for polarity/ground errors connect voltmeter to white neutral wire and green earth ground; for igniter/triac errors disconnect igniter and check resistance (should be 11-18 ohms).

SourceTrane XC80 Furnace - Service Manual: Variable Speed 2-Stagep. 30, 44-45

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

3 manuals in the MyPros+ library document this code for Trane furnace.

Models covered by the manuals that document this code

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The full 6 Flash procedure

Where this code is documented

Models covered by the manuals that document this code

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