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The Bard 910-1931 Flow Switch Assembly is an OEM safety-proving component used on Bard Q-TEC series packaged heat pump units to confirm proper water flow through the system before allowing operation. When flow is inadequate, this switch helps protect the unit by preventing unsafe run conditions that can lead to freeze damage or nuisance shutdowns. As a genuine Bard replacement part, it is built to match the original electrical and mechanical fit so technicians can restore dependable operation during service or troubleshooting. Verify compatibility by matching your unit model and parts list before ordering to ensure the correct switch for your application.