Lennox Error Code E150: A2L refrigerant leak alarm (Furnace)

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

Lennox error code E150 on a furnace means: A2L refrigerant leak alarm. It is also called Lennox diagnostic code E150.

Critical severityFurnaceEL296UHV · Lennox SL280UHV · Lennox ML180UHE

Homeowner? What Lennox code E150 means for you

Stop and call Your furnace is reporting: A2L refrigerant leak alarm. 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 E150 mean?

Listed in the 107045-XX table as an A2L refrigerant leak alarm; no corrective action text is given in the manual. The manual (including its troubleshooting section) gives no corrective procedure for this code; steps are general checks only.

Applies to: EL296UHV(X) series furnaces with integrated control 107045-XX only

Common causes of Lennox code E150

A2L refrigerant leak detected by sensor

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 E150

Show all 30 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

Other Lennox Furnace codes

Code	Meaning
E124	Lost communication with thermostat
E125	Control hardware failure
E126	Control internal communication problem
E130	Configuration jumper missing
E131	Corrupted control parameters
E132	Device control software fault
E151	A2L sensor fault
E152	Refrigerant leak sensor #2 fault
E154	Refrigerant leak sensor #1 communication lost / wrong DIP setting
E155	Refrigerant leak sensor #2 communication lost
E160	Refrigerant leak sensor #1 wrong type
E161	Refrigerant leak sensor #2 wrong type

All Lennox Furnace error codes →

Lennox code E150: homeowner questions

What does Lennox code E150 mean?

A2L refrigerant leak alarm. Listed in the 107045-XX table as an A2L refrigerant leak alarm; no corrective action text is given in the manual. The manual (including its troubleshooting section) gives no corrective procedure for this code; steps are general checks only.

Is it safe to keep using my furnace with code E150?

No. Code E150 is a safety shutdown, so keep the furnace off until a licensed technician has checked it.

Can I reset Lennox code E150 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 E150 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, Ignition Control 107045-XX Diagnostic Codes table, p.41. 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.