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critical Trane
Error Code E09
Shorted pressure switch open, pressure switch open, thermal limit, rollout switch or reverse airflow, flame detected but should not be present.
? What Causes This
Failed switches, clogged air intakes, improper positioning of components.
✓ How to Fix It
Check and replace faulty switches if found. Clean intake lines and vents. Verify proper installation procedures were followed.
Source: page 26 of the official manual
From the manual
This error code appears in:
Trane S9x1