HVACopediaLennox · Furnace
E111 Line voltage polarity reversed
What the control is telling you
The control detects reversed line power wiring (listed as low line voltage in the table). Note: the manual's text for this code is inconsistent; verify on the unit.
Applies to: EL296UHV(X) series furnaces (integrated control 103130-XX and 107045-XX)
Likely causes
- Hot and neutral swapped at the furnace
Test and repair steps
- Warning: Turn off power before rewiring.
- Verify hot and neutral are landed on the correct terminals; the control is polarity sensitive.
- Correct the reversed wiring.
- Restore power; normal operation resumes 5 seconds after the fault clears.
Settings for these units
- Recommended filter size by cabinet width · EL296UHV
- Recommended filter size by cabinet width · Lennox SL280UHV
- Filter sizes by cabinet width · Lennox ML180UHE
- Filter sizes by cabinet width · Lennox SL297NV
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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.33; Ignition Control 107045-XX Diagnostic Codes table, p.40. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.