c wire

  1. Aceflyer

    Burnham ES2 Series - C Wire Terminal

    Hi, My old mercury thermostat (2 wired) recently died and replaced it with a Nest Thermostat 1st Generation (2020). I have a Burnham ES2 Series gas fired boiler (Model # ES24BNI-T). After installing my Nest thermostat gave me an error N260 indicating that a C wire is needed. My thermostat is...
  2. Ron_Jeremy

    Nest thermostat not seeing the C wire but it's there...

    ...or maybe it isn't? Here's the wiring setup of the thermostat I just removed. Keep in mind I cannot confirm if it was ever wired correctly to begin with but the old thermostat chewed through 3 x AA batteries very quickly. Here's the wiring of our new Nest thermostat: However, the Nest...
  3. Samir A

    Need help on identifying and setting up c wire

    Hello all, I’m new to this forum and would like somebody to really help me. I had two Navien NCB 240 boilers installed three years ago, One boiler for my tenant upstairs and one boiler for the first floor and basement and I’ve attached the picture of a switching relay and my nest thermostat. It...
  4. larryjones

    Need to Add a C Wire

    Hi, I would appreciate any help on this. I have a 130 yr old house with a 5 yr old Buderus boiler running 3 zones. Two of the zones are fine and working on basic stats. The 3rd zone (upper floor) had a new wire run during recent renovation (by me) and I have since discovered that the wire is...
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