How To Change The Ac Thermostat. The most important thing you will want to do is turn the power off to the wires for your thermostat. Insert the wires into the corresponding terminals on the thermostat and tighten the terminal screws.
So every time you replace your air conditioner or heater you should be installing a new thermostat as well. Connect the thermostat wires we label early to the new thermostat subbase. Insert the batteries backward so the negative sides line up to the positive terminal for five seconds.
If the screen is blank or unlighted a battery change could solve the problem.
There may be a metal jumper connecting the R and Rc terminals on the new thermostat. Other thermostat malfunctions could also be the result of bad batteries. DIY Thermostat Sensor Repairs. In case any of you ever find yourself needing to replace an old thermostat Ive documented the steps below with photos on how I replaced my old one with a Honeywell Lyric.
