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Lennox · Furnace

E310 Discharge air sensor failure

Medium severity EL296UHVLennox SL280UHVLennox SL297NV

What the control is telling you

Discharge air temperature sensor is shorted or out of range. 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

  • Failed sensor
  • Wiring fault

Test and repair steps

  1. Measure sensor resistance and compare to the temperature/resistance chart.
  2. Check sensor wiring.
  3. Replace the sensor if out of range.
  4. Clears 30 s after recovery (communicating) or after the heat call ends (non-communicating).

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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.36; Ignition Control 107045-XX Diagnostic Codes table, p.43. 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.