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Lennox · Furnace

E291 Heat airflow below minimum

High severity EL296UHVLennox SL280UHVLennox SL297NV

What the control is telling you

Heating airflow is restricted below minimum; 1-hour soft lockout.

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

Likely causes

  • Dirty filter
  • Duct restriction
  • Blower performance problem

Test and repair steps

  1. Inspect the filter (should be checked monthly) and replace if dirty; oversized pressure drop from high-efficiency filters can trip the limit.
  2. Measure external static pressure heating speed must not exceed 0.8 in. w.c.
  3. Measure temperature rise (supply minus return) and confirm it is within the rating-plate range, adjusting blower heat speed (DIP 11-13) if needed.
  4. Check the blower wheel for debris and verify blower operation.
  5. Clears when a heat call completes successfully.

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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.36. Summarized in our own words; check the original manual for your model.

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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.