1993 Dutchman thermostat upgrade to digital
I am trying to upgrade my furnace thermostat. To a Honeywell rth221b . The only thing my furnace thermostat does is operate the furnace only. No ac or fan control. I can get it to turn the furnace on ...
Forum Discussion
I tried the wiring of what you listed above it wouldn't do anything here is the way it was wired prior to taking them off the old one
