Error code reference
Trane Furnace Error Code 2 Flash
Flame lost or ignition failure
Flame lost or ignition failure - flame is off when it should be detected (RECYCLE) or furnace tries to light but no flame is detected (RETRY); 10 recycles or 3 ignition attempts in a single call for heat results in 1-hour soft lockout.
First step from the service manual
Scroll through User Interface to view Last 4 Faults; disconnect power and connect manometer to check inlet gas pressure (must be above 14" WC).
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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Get the full diagnostic procedure for 2 Flash.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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