13 is limit circuit lockout, in which case your furnace would try and restart after 3 hours. The limit circuit is there to protect the furnace from overheating if there is insufficient airflow through the heat exchanger taking the heat away from the furnace and pushing it into your ductwork.Click to see full answer. Moreover, what is a limit circuit lockout?[7] LIMIT CIRCUIT LOCKOUT — Lockout occurs if the limit or flame rollout switch is open longer than 3 minutes or 10 successive limit trips occured during high-heat. Improper limit switch or no limit gasket. Dirty filter or restricted duct system.Similarly, what does limit circuit open mean? Usually an open limit is due to a airflow problem which causes the heater to heat up and trip a limit, do you have a clean air filter?? or it could be worse and the heater may have rolled out due to a bad heat exchanger, in either case, have a licensed repairman come out to look at the heater. In this way, is there a reset button on a carrier furnace? Press and release the raised red button at the center of the flame roll-out switch to reset the furnace. You can press the reset button up to three times before troubleshooting the furnace’s internal components or calling for repair service; allow 30 minutes between each reset.Can you bypass furnace limit switch?First, turn the power off to the furnace. If you have an ohmmeter, you can measure the resistance across the switch. If the temperature is below the setpoint, the resistance across the switch should be zero. If you do not have an electrical meter, you can temporarily bypass the switch and see if the furnace works.

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