Goodman Error Code E3 indicates Primary or auxiliary limit circuit open or rollout limit circuit open (High limit open). 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
Primary or auxiliary limit circuit open or rollout limit circuit open (High limit open)
Circulator blower runs continuously; no furnace operation; LED displays E3 and thermostat shows ‘Check Furnace’
Insufficient conditioned air over heat exchanger (blocked filters, restrictive ductwork, improper blower speed, failed blower motor); flame rollout; misaligned burners; blocked flue or air inlet pipe; failed induced draft blower; loose wiring
Check filters and ductwork for blockage; clean filters and remove obstructions; check blower speed and performance and replace blower motor if necessary; align burners; inspect flue and air inlet piping; check induced draft blower performance; tighten wiring; follow notes regarding temperature rise and vent piping
Primary limit switch, auxiliary limit switch, rollout switch, circulator blower, burners, flue/inlet piping, induced draft blower, wiring
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: