HVACopediaLennox · Furnace
E241 Flame sensed out of sequence - flame present
What the control is telling you
Flame is sensed when the gas valve should be closed.
Applies to: EL296UHV(X) series furnaces (integrated control 103130-XX and 107045-XX)
Likely causes
- Gas valve leaking through or stuck open
Test and repair steps
- Warning: Shut off gas to the furnace (gas valve switch OFF, by hand only - never use tools; replace the valve if the switch will not move).
- With no call for heat, confirm whether flame is present or flame current is still being sensed.
- Check if the gas valve is being energized without demand (shorted wiring or control relay).
- If the valve leaks through while de-energized, replace it with the same type of valve; do not attempt repair.
- After repair, restore gas, leak-check connections with a gas leak detector (no open flame) and run a full heat cycle.
- Code clears once the fault is gone / flame is proven stable.
Settings for these units
Recommended filter size by cabinet width · EL296UHV
| Cabinet width | Side return | Bottom return |
|---|---|---|
| 17-1/2 in. | 16 x 25 x 1 in. (1) | 16 x 25 x 1 in. (1) |
| 21 in. | 16 x 25 x 1 in. (1) | 20 x 25 x 1 in. (1) |
| 24-1/2 in. | 16 x 25 x 1 in. (2) | 24 x 25 x 1 in. (1) |
Number in brackets is the quantity of filters.
Filters are field supplied and installed outside the furnace; inspect monthly.
Recommended filter size by cabinet width · Lennox SL280UHV
| Cabinet width | Side return | Bottom return |
|---|---|---|
| 14-1/2 in. | 16 x 25 x 1 in. (1) | 14 x 25 x 1 in. (1) |
| 17-1/2 in. | 16 x 25 x 1 in. (1) | 16 x 25 x 1 in. (1) |
| 21 in. | 16 x 25 x 1 in. (1) | 20 x 25 x 1 in. (1) |
| 24-1/2 in. | 16 x 25 x 1 in. (2) | 24 x 25 x 1 in. (1) |
Number in brackets is filter quantity; filters are field supplied.
Never run the unit without a filter installed.
- Filter sizes by cabinet width · Lennox ML180UHE
- Filter sizes by cabinet width · Lennox SL297NV
Models that show this code
34 models in EL296UHV, Lennox SL280UHV, Lennox ML180UHE, Lennox SL297NV
Other codes on the same units
- E227 Low pressure switch opened during ignition or run
- E228 Inducer calibration failure
- E229 Ignition on high fire
- E240 Low flame current (run mode)
- E250 Limit switch circuit open
- E252 Discharge air temperature too high
- E270 Soft lockout - no flame after max retries
- E271 Soft lockout - retries exceeded, pressure switch opened
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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.35; Ignition Control 107045-XX Diagnostic Codes table, p.42, Start-Up / Gas Valve Operation p.81. 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.