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    Nest Thermostat E with Heatlink replacing a Honeywell CM67

    hi I’ve bought a Nest Theromostat E with Heatlink to replace a Honeywell CM67. On removing the old thermostat there are only two wires connected with a third black wire hiding away behind the unit. i assume this isn't connected to anything. I havn't opened the box yet because its non-refundable...
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