So after a lot of troubleshooting, testing, and frustration here is what
I found.1. The first issue is that whoever set up the furnace wires used
cat5e instead of the correct gauge furnace wiring. 2. They did not setup
the C line supplying 24V DC, wh...
You shouldn't need the jumper if you just have it for heating (Rh). With
cooling (Rc), you would run a separate line to it and then the AC
compressor would route to (Y). I am having the same issue with the
furnace - it worked fine for years, then out...
Having the same issue - the old (dumb) thermostat worked fine for years,
then stopped. You hear the heat turn on, but the blower motor never
engages. I installed the Nest 3rd gen, and it recognizes the three
components - power, heat, fan. The weird t...