HVACopedia

Lennox · Furnace

E401 LSOM - long run or low pressure

Critical severity EL296UHVLennox SL280UHVLennox SL297NV

What the control is telling you

Compressor ran more than 18 hours on one demand; also tracks low pressure switch trips. Critical alert.

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

Likely causes

  • Low refrigerant charge
  • Undersized system / high load

Test and repair steps

  1. Check system charge and low pressure switch operation.
  2. Check for airflow or load problems.
  3. Clears after 30 consecutive normal cycles or power reset.

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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.