Hi all I have an extra wire that’s red in colour coiled up behind my thermostat and I was wondering if I can use it as a C wire for my new smart thermostat. I’ve attached a picture of what my current thermostat setup looks like. Thanks for any help
Hi,
I’ve asked this question to people I work with but have different answers, so thought I’d try here. What is a common wire and what does it do?
Thanks.
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