Lennox Error Code E150 indicates Refrigerant leak detected. Start by checking the most common and safe items identified in the troubleshooting section. If the code returns after those checks, professional diagnosis is recommended.
Professional Required
Refrigerant leak detected
Unknown
Presence of refrigerant leak at or in the indoor unit coil; refrigerant detection system sensor reporting leak
Repair leak in indoor unit coil; verify proper refrigerant charge; fault cannot be cleared while leak is detected
Indoor coil, refrigerant detection sensor
Call an HVAC technician if the error persists after completing the recommended basic troubleshooting steps or if the system repeatedly locks out.
Disconnect power before inspecting the equipment. Never bypass safety devices or operate the system if you suspect unsafe conditions.
Learn more about the furnace components and operating conditions commonly associated with diagnostic error codes: