Fault Code Lookup

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e6.3

Igniter relay fails OR igniter open

This code typically points to

Igniter relay failure
Igniter open

Next checks to confirm

Test ignitor continuity/resistance
Verify igniter relay operation on board

Escalation

Ignition fault / no heat

Reset behavior

Clears when igniter circuit restored.

Urgent

Fix now

⚠ Cross-generation conflict

Legacy Code 6 bundled multiple electrical issues into one code. The newer S-series splits the same territory into e6.1 (polarity), e6.2 (grounding), and e6.3 (igniter relay/open) — more precise diagnosis.

Source

Trane 18-CE04D1-1D-EN, code table page 58

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