e6.1
Voltage reversed polarity
This code typically points to
- Reversed line-voltage polarity
Next checks to confirm
- Verify line polarity
Escalation
Electrical/control fault
Reset behavior
Clears when polarity corrected.
Urgent
Fix now
Fault Code Lookup
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⚠ 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-CE12D1-1D-EN code table; same namespace in 18-CE04D1-1D-EN