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Lennox · Furnace

12 flashes Flame sensed with gas valve off

Critical severity Lennox EL195UHNE

What the control is telling you

The control senses flame when the gas valve should be closed. Gas valve stays off, inducer on, blower on heating speed.

Applies to: EL195UHNE furnaces with ignition control 103217-03 or 107163-01 (red LED)

Likely causes

  • Gas valve leaking through
  • Gas valve energized by miswiring
  • Flame sensor shorted to ground / control fault

Test and repair steps

  1. Warning: Shut off gas to the furnace (valve switch by hand only).
  2. Look for flame at the burner with no call for heat; if present the valve is leaking - replace it.
  3. Check the gas valve wiring (pins 9 and 12) for a short that powers the valve.
  4. Check the flame sensor wire for shorts; if no flame is present, replace the control.

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Source: Lennox EL195UHNE Unit Information Corp 1801-L1 (rev 04/2024), Table 4 (103217-03) / Table 5 (107163-01) diagnostic codes, p.8-10; flowchart p.51. 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.