It sounds like you have a dual fuel system, like a heat pump and a furnace. If you’re not sure, check here. Regardless, it should be compatible with the Nest Learning Thermostat (not other models). I think the W/E wire you mentioned is more likely a W/B wire, and Nest thermostats don't use jumper wires, so don't enter that into the app or connect it. They use an internal jumper wire if your system needs it.
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