Screen on Bryant thermostat is blank---Batteries?

Change the batteries

If it only has 2 wires, and the thermostat is digital, it has to have batteries. If you can't find them, pick up a new thermostat (heat only needed since you only have 2 wires) and replace. Red is power 24v & White is heat.

Reasons for a Blank Screen on a Honeywell Thermostat ...

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Honeywell and other brands of programmable thermostats typically show a blank ...and the batteries can no longer provide power to the screen, it will go blank. ...electrical system, a blank screen indicates there is no power going to the unit, ...

programmable thermostat troubleshoot - YouTube

? 3:35
https://www.youtube.com/watch?v=pNVTAUcBx-U
Sep 26, 2011 - Uploaded by Maxxmentum
Programmable thermostat started to fail and behave erratically after being in service for a few ... My thermostat works but the remotes have stopped working. .... Honeywell CM907 Digital Programmable Room Thermostat user ...

HEAT WON'T TURN ON How Test if your Thermostat is ...

? 2:36
https://www.youtube.com/watch?v=lSJn69EAcAw
Nov 16, 2014 - Uploaded by You can Fix It!!!!
Heater fails to turn on it does not mean you have a faulty heating system ... 4th - Check programming on a programmable

Double check batteries are facing correct direction.

The thermostat, depending on the model, normally does not get powered by batteries, they are for backup power. You might be losing 24 volt from the furnace, causing the thermostat to run on batteries.

My guess is that you have gas heat. If this is the case, sounds to me like your main control board or depending on age of furnace, fan controller is not working. With gas furnaces, it utilizes 2 fan speeds. High for cooling, & Low for heating. Your thermostat only controls the High speed - switches when you turn your fan on & when there is a call for cooling. The only other thing I can think of is it is possible that the Low speed windings on the blower motor are open causing it to not turn on. Most motors have 3 to 4 speeds & only 2 are used. Switch the heat motor wires in the furnace (on the control board) with one that is on a spare terminal.

I had blank screen also. I placed my screwdriver between the battery terminal and battery tab and voila the screen turned on. I removed the batteries, pulled the tab out, replaced the batteries, and the thermostat is working like a champ again.

There may be a fuse at the heating system that popped. Check on the heating system circuit board or an in-line fuse.

I would try replacing the batteries first. that should cure the problem.

un snap the t-stat off the wall yo find the batteries