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Trane Furnace Error Codes & Fix Guides

Trane Furnace display showing CODE LIST — FixCode Guide error code graphic

All FixCode Guide coverage for Trane furnace error codes: start with the complete code list, or jump to a deep-dive guide for a specific code. Everything is verified against Trane manufacturer documentation.

Guides in this section

Trane Furnace Error Codes List: Every Code Explained

Most searched Trane furnace codes

Code	Meaning
3 Flashes	Pressure switch fault — the pressure switch did not close (or the inducer/vent proof failed) on Trane furnaces with LED blink diagnostics.
E09	Platform-specific Trane code (communicating/ComfortLink-era systems render faults in E-format) — not part of Trane's classic blink-code list; the model/thermostat documentation defines the branch.