Industrial Maintenance Technician Practice Test 2026 – Your All-in-One Guide to Exam Success!

The best suspicion to consider when a resident states that the furnace will not blow air at all is that any of the issues listed could be the cause, thus supporting the selection of the broad option. A defective thermocouple could prevent the ignition of the furnace, leading to a complete lack of air movement if the system has not started up at all. A clogged air filter can restrict airflow significantly; although this typically results in the system struggling to push air rather than a complete failure, it's still relevant in broader diagnostic considerations if the furnace cannot operate efficiently. Lastly, a broken fan motor would directly impact the ability of the furnace to blow air, as without a functioning motor, the system cannot circulate the heated air into the residence. Therefore, each of these components plays a critical role in the operation of a furnace, and any one of them failing can result in the furnace not blowing air at all, which makes the broader option the most appropriate choice to consider first.