Which of the following is NOT a sign of a furnace limit switch issue?

A furnace limit switch is a critical safety component that is designed to monitor the temperature within the furnace and prevent overheating. When examining the signs of a furnace limit switch issue, it is helpful to understand what each symptom implies.

Continuous overheating indicates that the limit switch may not be functioning correctly, as it should deactivate the furnace if it senses excessive heat to prevent damage or fire hazards. Similarly, if the furnace frequently shuts down, it could be a result of the limit switch responding to high temperatures too frequently, indicating it is malfunctioning.

If the furnace takes too long to respond, this can also be a symptom of a limit switch problem, as delays in operation might be attributed to incorrect readings or delays in activation from the switch.

In contrast, when the furnace starts without any problems, it demonstrates that the ignition and startup sequences are working correctly, suggesting that the limit switch is likely not a problem at that moment. Therefore, this condition does not indicate any issue with the limit switch, making it the correct answer in identifying what is NOT a sign of a furnace limit switch issue.