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Is this a heat pump system or does your heat use gas heat?
Remove the thermostat cover and check to see if it has batteries in it.
No. Do you have a voltmeter? Do you see the terminals labeled R W Y G C ?
One moment please while I look up this model thermostat.
Accoding to the diagram, there is a C terminal on this thermostat. Are you sure you dont see a C terminal?
That means that this thermostat has a short in it and is defective or a wire is loose. Check the wiring to make sure they are securely tightend to their terminals. If problem persist, replace the thermostat. Please rate this session if you are satisfied with this answer.
Yes. that is why I recommend you replace the thermostat. This must be a heat only system.
Do you need any further assistance?
Go to the furnace when it shuts off. Look on the furnace control board and tell me what pattern the red light is flashing in. 3 flash pause, 2 flash pause, etc.....
This is an issue with the furnace. This thermostat is powered by the 24 volts that come from the furnace. The furnace 24 volts is dropping in and out due to an isssue with the furnace. I advise you to call a hvac tech out to check the furnace to find out why the power is dropping in and out.
It is possible. But based on the evidence, I think it is more likely the furnace is the culprit
I wish you could go to the furnace in the attic to check the status of the furnace control board while it is off.
It can be in the attic, or the crawl space or a closet in the house. It varies. I could not tell you exactly where your furnace is located. However you may be on to something when you say the blower does not come on. Your blower motor inside the furnace may be bad. I strongly urge you to call a tech at this point.
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Remove the thermostat cover. You should see a R G Y W C terminal. Place the voltmeter leads on the R to G then R to Y then R to W and so on and tell me if you get 24 volts on any of them.