If your Honeywell smart thermostat lacks a dedicated C-wire (common wire) inside the wall box, you have several safe workarounds. You can install the included Power Extender Kit (PEK) at your furnace control board (if provided with your model) to multiplex existing wires, use an external 24V plug-in transformer adapter, or hire an electrician to pull a new multi-conductor thermostat cable through your walls. Relying on internal battery power alone without a C-wire often causes Wi-Fi dropouts and power faults. Verification: Check the voltage metrics in your thermostat settings menu to confirm stable 24V continuous power delivery after installation.
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