Why does my thermostat have no display?
If your thermostat wall does not have a c-wire, or common wire, your thermostat most likely is not hooked up to your HVAC system for its power and needs batteries.
When your screen is blank, it could indicate you need to replace the batteries.
Most thermostats display a low-battery symbol when the juice is running low..
Why is my Honeywell thermostat not working?
If your screen is blank and unresponsive, or flashing, it may mean your thermostat’s batteries are dying. Try replacing them to see if it helps. This could also be the cause of a loose or poorly attached wire. … If your sensor is broken, your Honeywell thermostat could be reading the wrong temperature in the room.
How do I get my Honeywell thermostat to work after changing the battery?
Honeywell 4000 series (Th4110D/ TH4210D)To remove and replace the batteries, pull at the bottom of the thermostat to remove it from the wallplate.Once removed, turn the thermostat over and insert 2 fresh AA batteries, and then reinstall the thermostat on the wallplate.
How do I reset my thermostat?
Here are the steps you need to take to reset your AC thermostat.Shut Down Your AC at the Thermostat. … Find Your Circuit Breaker Box. … Reset the Circuit Breaker for Your AC Unit. … Wait 30 Seconds. … Turn the AC Thermostat Back On. … Call Vredevoogd Heating & Cooling for all your Furnace & AC needs.
Why is my AC not working after battery change?
Disconnect the battery negative cable, recheck your install, look for a disconnected electrical plug for one of the pressure switches for the A/C system, you may have accidentally disconnected or broke one of then during battery replacement, if none are found then have the A/C system checked by a professional, …
Is there a reset button on a Honeywell thermostat?
Click on the “SYSTEM”. Now, you have to hold the centre button for few settings to get the required option. Once you see “Reset to factory settings”, click on it. The thermostat will restart and voila!