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Difficulty upgrading thermostats due to inconsistent wiring

🏠 homeproduct problemSingle report ●●●●● severity 2/5

A new homeowner of an older property reports difficulty upgrading multiple thermostats because the existing furnace control board wiring is inconsistent, with some zones lacking a common (C) wire required for modern smart thermostat installation.

Who's affected: A homeowner with a multi-zone heating system and mixed-age wiring.

⚠️ Single report. This is one person's account. We mark it so until more voices confirm it.

What people do today

🔧 Fix this

Ideas a builder, maker or community group could start on:

  1. A universal power-stealing adapter kit that works with any furnace control board to provide constant C-wire power without needing new wall wiring.
  2. A diagnostic mobile app that uses photos of control board terminals to generate a custom wiring diagram for specific thermostat models.
  3. A standardized, easy-to-install wireless thermostat bridge that connects to the furnace board and communicates wirelessly with multiple zone thermostats.
I want to build this

Real voices

“I want to replace the thermostat wires with 3 wire thermostat wires and connect R, W, and C to each thermostat”

Source: Stack Exchange (diy) · CC BY-SA 4.0, user-contributed content from Stack Exchange; summarized and modified

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