Lennox Error Code E241: Flame sensed out of sequence – flame present (Furnace)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Lennox error code E241 on a furnace means: Flame sensed out of sequence - flame present. It is also called Lennox diagnostic code E241.

Critical severityFurnaceEL296UHV · Lennox SL280UHV · Lennox ML180UHE · Lennox SL297NV

Homeowner? What Lennox code E241 means for you

Stop and call Your furnace is reporting: Flame sensed out of sequence - flame present. This code is a safety shutdown. Turn the furnace off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Lennox error code E241 mean?

Flame is sensed when the gas valve should be closed.

Applies to: EL296UHV(X) series furnaces (integrated control 103130-XX and 107045-XX)

Common causes of Lennox code E241

Gas valve leaking through or stuck open

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Lennox models that use code E241

Show all 34 models

EL296UH045XV36B EL296UH070XV36B EL296UH090XV36C EL296UH090XV48C EL296UH090XV60C EL296UH110XV48C EL296UH110XV60C EL296UH135XV60D ML180UH045E36AK ML180UH045XE36AK ML180UH070E36AK ML180UH070E36BK ML180UH070XE36AK ML180UH070XE36BK ML180UH090E48BK ML180UH090E60CK ML180UH090XE48BK ML180UH110E60CK ML180UH110XE60CK ML180UH135E60DK SL280UH060NV36A SL280UH070V36A SL280UH080NV48B SL280UH080NV60C SL280UH090V36B SL280UH090V48B SL280UH090V60C SL280UH100NV60C SL280UH110V60C SL280UH135V60D SL297UH040NV36B SL297UH060NV36B SL297UH080NV48C SL297UH080NV60C

Other Lennox Furnace codes

Code	Meaning
E225	High pressure switch failed open
E226	High pressure switch failed closed
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
E272	Soft lockout - recycles exceeded, pressure switch opened
E273	Soft lockout - recycles exceeded, flame failure

All Lennox Furnace error codes →

Lennox code E241: homeowner questions

What does Lennox code E241 mean?

Flame sensed out of sequence - flame present. Flame is sensed when the gas valve should be closed.

Is it safe to keep using my furnace with code E241?

No. Code E241 is a safety shutdown, so keep the furnace off until a licensed technician has checked it.

Can I reset Lennox code E241 myself?

Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.

Who can fix Lennox code E241 near me?

Aurora Star Tech Inc. repairs Lennox furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

Troubleshooting guides

Blowing cold air All brands · Furnace
No heat All brands · Furnace
Short cycling All brands · Furnace
Blower motor does not run - Lennox SL280UHV ECM checks Lennox · Furnace
Display shows two horizontal bars (soft disable) - Lennox SL297NV Lennox · Furnace
Furnace will not run (no heat) - Lennox EL195UHNE Lennox · Furnace
Furnace will not run (no heat) - Lennox SL297NV Lennox · Furnace
Furnace will not run - Lennox SL280UHV checklist Lennox · Furnace
Indoor blower does not run - Lennox EL195UHNE Lennox · Furnace
Indoor blower does not run - Lennox ML180UHE Lennox · Furnace
Poor ignition or combustion resonance - Lennox EL195UHNE Lennox · Furnace
Poor ignition or loud combustion resonance - Lennox SL280UHNV Lennox · Furnace
Two horizontal lines on display (soft disable) - Lennox communicating Lennox · Furnace

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. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.