How to Wire Status Lights for Each Thermostat in a Series Circuit Configuration

The discussion addresses wiring status indicator lights for each thermostat in a series circuit configuration controlling a furnace. The requirement is to maintain thermostats connected in series so that if any thermostat opens, the entire system shuts off. The challenge is to have individual status lights that indicate whether each thermostat is closed (light on) or open (light off) without breaking the series connection. A parallel wiring of thermostats and lights was suggested but rejected because it does not preserve the series operation. The solution involves a specialized wiring approach allowing each thermostat to control its corresponding indicator light while keeping the thermostats in series. A proposed circuit diagram was shared, enabling each status light to reflect the state of its thermostat without compromising the series circuit functionality.
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