Trying to swap an old Honeywell thermostat for new with Wi-Fi. Old thermostat doesn’t need C wire, but I have an unused blue wire in the wall. I installed the new thermostat correctly with the C wire, went down to my furnace and securely connected the C wire into the C terminal there (there’s another wire in the terminal as well, I’ve double checked their connections), but still get no power to the thermostat. Furnace is a mid-00s electric Frigidaire, pretty simple setup. I’ve swapped thermostats before but have yet to run into this problem, any help appreciated!