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The Bard 8201-071 is an OEM 3PDT control relay with a 24V coil and contacts rated 7A at 240V, used to switch multiple circuits at once as your Bard wall mount unit calls for heating, cooling, or fan functions. When a relay is chattering, sticking, or failing to pull in, it can cause intermittent operation or no response to thermostat signals, so replacing it with the correct Bard part helps restore reliable, factory-correct electrical sequencing and protects connected components. Verify the relay style and terminal layout against your unit wiring diagram and match the coil voltage and contact ratings before installation.