Red Seal Appliance Service Technician Practice Exam

What function does a pressure switch serve in a washing machine?

1. Repairs leaks in the system

2. Controls the spin cycle speed

3. Detects water level and controls fill

4. Initiates the drainage process

The correct answer is: Detects water level and controls fill

The pressure switch in a washing machine primarily serves to detect the water level within the drum and control the filling process. It functions by responding to changes in water pressure as the drum fills with water. When the water reaches a predetermined level, the pressure switch sends a signal to the machine's control system to stop filling and can also guide the machine through various cycles. This component is crucial for ensuring that the washer does not overfill, which could lead to leaks or water damage. Additionally, the pressure switch helps regulate the machine's operation, enabling it to run efficiently and effectively. Other functions like repairing leaks, controlling spin speed, or initiating drainage processes are managed by different components of the washing machine, making the pressure switch's role specifically focused on water level detection and filling control.