HVACopedia

Lennox · Furnace

E404 LSOM - locked rotor

High severity EL296UHVLennox SL280UHVLennox SL297NV

What the control is telling you

Compressor rotor locked (shorted run capacitor, seized bearings, excess liquid refrigerant).

Applies to: EL296UHV(X) series furnaces with integrated control 103130-XX only

Likely causes

  • Shorted run capacitor
  • Seized bearings
  • Excess liquid refrigerant

Test and repair steps

  1. Warning: Disconnect power before testing capacitor.
  2. Test the run capacitor.
  3. Check for liquid floodback.
  4. Replace failed components; clears after 4 normal cycles or power reset.

Settings for these units

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.37. 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.