Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

A furnace that fails to ignite can indeed be affected by multiple factors, all of which can contribute to the problem. Each individual issue can interrupt the successful ignition process.

A clogged air filter can restrict airflow, which is essential for combustion. When the airflow is limited, the furnace may not reach the necessary temperature or have the right mix of air and fuel for ignition to occur. This can lead to incomplete combustion or failure to ignite entirely.

A faulty ignition module is critical to the ignition process as it produces the spark necessary to ignite the fuel, whether that is natural gas or propane. If the ignition module is malfunctioning, it can't generate the spark needed to start the combustion process, resulting in the furnace not igniting.

Additionally, a disconnected power source prevents the entire system from functioning. Without power, the ignitor won't receive the energy needed to operate, which stops the ignition sequence completely.

Each of these reasons represents a distinct failure point in the ignition system of a furnace. Taking into account that any one of these issues—clogged air filter, faulty ignition module, or disconnected power source—could individually cause the furnace to fail to ignite, the correct conclusion is that all of the above factors contribute collectively to the problem. This underscores the importance