NATE Gas & Oil Heating Systems Practice Test 2026 – Complete Exam Prep

When analyzing the situation where an indoor blower motor on a high-efficiency furnace does not de-energize after the "Off Delay," it's essential to understand the role of the control module in this process. The control module is responsible for regulating various components of the furnace, including the blower motor's operation.

In a high-efficiency furnace, the "Off Delay" is designed to keep the blower running for a predetermined time after the heating cycle to help distribute residual heat and improve efficiency. If the blower motor does not turn off as intended, it suggests that there may be an issue with the control module's programming or operation. This means that the control signal to turn off the motor is not being properly executed, indicating that the control module may need to be replaced to restore proper functionality.

While cleaning the blower motor or adjusting the thermostat may have some relevance in different scenarios, they wouldn't directly address the issue of the blower motor failing to de-energize after the designated off period. Similarly, changing the gas orifice pertains to fuel delivery rather than electrical control issues. Therefore, replacing the control module stands out as the logical repair because it targets the root of the problem affecting the blower motor's operation.