Trane Furnace Error Code 6 Flash
Line polarity fault (voltage reverse polarity), ground fault (proper earth ground not detected), igniter…
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.
First step from the service manual
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).
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for 6 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
$29/month · Cancel anytime · Or $9.95 3-day pass
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass