Lennox Error Code E113 indicates High line voltage. 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.
Easy
High line voltage
Unknown
Line voltage higher than nameplate rating
Provide power voltage within proper range; system resumes normal operation 5 seconds after fault recovered
Power supply
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: