In a no-heat situation where a fan motor isn't operating, who performed the correct procedure by measuring voltage?

The correct procedure in this scenario would involve measuring voltage at the bimetal fan control. This component plays a crucial role in regulating fan operation based on the temperature of the system. By checking the voltage here, a technician can determine if the control is receiving the appropriate signal to activate the fan motor or if there is an issue preventing it from operating.

Measuring at the bimetal fan control is essential because it provides insight into whether the control mechanism, which typically responds to temperature changes, is functioning as expected. If there is no voltage present here, it suggests that the control itself may be faulty, thus preventing the fan motor from engaging properly in the no-heat situation.

In contrast, testing at the fan relay's normally open contacts may not offer a complete picture of the system's functionality in this scenario. The relay may not receive the necessary input from other controls, leading to a misdiagnosis if only that connection is assessed.

In summary, the procedure taken by measuring at the bimetal fan control directly targets the control responsible for the fan operation, making it a critical step in diagnosing the no-heat issue.