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A flow switch is a safety device commonly used in boilers and heating systems to detect the flow of water or other fluids. It ensures that the system only operates when there is adequate flow, protecting components from damage due to dry running or blockages. This flow switch is an important part of boiler maintenance and repair, helping to maintain safe operation. If you are troubleshooting a boiler that fails to ignite or shuts down unexpectedly, a faulty flow switch could be the cause.