EWC Controls Forum

Update: Done. This was a SUPER easy install. Thanks Steve! Had two hiccups that I worked through. One was confusion on how long it took they system to switch from heat to cool to test. Solved this problem by reading the manuals “common issues” and hitting “reset” to skip the timer. The other was con...

Nice. Seems pretty simple. I’ll steal a C wire from somewhere for the bottom thermostat. Probably have to run a whole new cable upstairs as that’s only 3. I came across this YouTube video of a guy doing exactly what I have to do, literally, but he said I shouldn’t put two wires in the red RC/RH slot...

Both spare? I don’t need a common now for the two nest learning thermostats? If not I’ll just tie them off and tuck them. I assume everything else is 1:1 judging by some quick googling although the wiring on “system” and “24dc transformer” is labeled different. In system: I have R (to your RH or RC?...

Alright. NCM300 it is. I’ll look into that today. Will this new board allow me to automate the “manual changeover” you mentioned? It appears my master has both heat and ac was working with no changeover required currently (although I assume the slave will need changeover with only 3 wires. Can I jus...

Main post seems to only show 3 pics on my post through mobile so I added the rest here:

Edit: Job complete and thread closed. Super easy. Highly recommend doing it yourself. EWC is super fast and helpful to boot. Hi all. First time homeowner here who really doesn’t want to pay the $800 I was quoted to fix this. So I have an old pair of basic thermostats I want to upgrade to Google Nest...