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Procedures for Testing a Water Flow Switch

Updated February 21, 2017

Warming water for dishwashing or showers is the job of the home's hot water boiler. Many components work with the boiler assembly, including the water flow switch. This switch has testing procedures for verifying its functionality.

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Water Flow Switch Functioning

The water flow switch senses hot water being accessed from the boiler and activates the boiler's pump for replacing the water. Normally, the switch attaches to the main cold water line supplying the boiler.

Flow Switch Testing

The flow switch test procedure requires an ohmmeter, which measures resistance of the switch's electronics. Attach the ohmmeter to the two wires extending from the switch. Push the switch's plunger into the water flow's direction, and watch the ohmmeter's measurements. The ohmmeter should show a value referred to as "continuity," or a completion of the circuit. If no value appears on the display, the water flow switch needs replacement.

Flow Switch Care

The water flow switch needs periodic cleaning, which allows a longer component lifespan. Clean the particles from the inside spring mechanism for the best functioning results.

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About the Author

Writing professionally since 2010, Amy Rodriguez cultivates successful cacti, succulents, bulbs, carnivorous plants and orchids at home. With an electronics degree and more than 10 years of experience, she applies her love of gadgets to the gardening world as she continues her education through college classes and gardening activities.

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