When troubleshooting an ignition issue, which component is least likely to be the source of the problem if the system has power?

In addressing ignition issues within a heating system, it's important to consider the function and role of each component involved.

The igniter is essential for initiating the combustion process by generating the heat needed to ignite the gas. If the system has power but the igniter is faulty or damaged, it would fail to perform its job, resulting in ignition problems.

The gas valve controls the flow of gas into the combustion chamber and is critical for the ignition process. A malfunctioning gas valve could prevent gas from reaching the igniter, thus causing ignition issues even if the system is powered.

Electrical connections are vital as they ensure that the components receive power and communicate effectively. Faulty connections could lead to components, including the igniter, not operating appropriately, resulting in similar ignition difficulties.

The filter, on the other hand, primarily serves to clean the air entering the system. While a clogged filter can lead to airflow issues and impact overall system performance, it does not directly affect the ignition process if the system is receiving power. Therefore, a dirty filter is the least likely cause of ignition problems when power is established, as it does not interfere with the igniter's ability to produce heat or the gas valve's function.