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Pressure switch fault — vent, inducer, or switch problem.
Brand: Trane (Also covers American Standard) | Equipment: Gas Furnace
3 LED flashes on a Trane furnace means the pressure switch did not behave as expected. Either it didn't close when the inducer started, or it didn't open between cycles.
What: Snow, ice, birds nests, or disconnected pipe block proper venting.
How to check: Inspect outdoor exhaust outlet.
Fix: Clear blockage.
Shop partsWhat: Inducer can't pull enough draft to close pressure switch.
How to check: Listen at startup; should run smoothly.
Fix: Replace inducer.
Shop partsWhat: Switch contacts stuck or contacts not closing on normal pressure.
How to check: Test continuity at switch with manometer.
Fix: Replace switch.
Shop partsTry our interactive symptom diagnostic tool or browse Trane parts.