What could indicate a malfunction in the furnace's ignition system?

A malfunction in the furnace's ignition system can often be indicated by the absence of sound when attempting to ignite. Typically, a functioning ignition system will produce some audible click or sound as the igniter attempts to light the fuel. If there is no sound at all, it may suggest that the igniter is not receiving power, the ignition mechanism is faulty, or there is another significant issue preventing the ignition process from starting.

While continuous operation without cycling might indicate other issues, such as a stuck thermostat or a problem with the limit switch, it does not directly point to ignition failure. Unusual odors during operation could indicate gas leaks or other fuel-related problems, which could be serious but are not specific to the ignition system. Increased noise levels from the blower could suggest mechanical issues with the blower motor or the fan but also do not specifically link to the ignition system itself. Understanding these distinctions is crucial for diagnosing furnace problems accurately.