Lennox Error Code E163 indicates Furnace control board failure. 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
Furnace control board failure
Unknown
Issue with furnace control board
Replace indoor unit control board; fault clears when controller operates normally
Furnace control board
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: