I woke up this morning to find my heat had turned off. I went to my non-programmable thermostat to see that there was no power to this device. I pressed a few of the buttons and nothing happened. The screen would not light up at all. I then went to the main circuit breakers in the garage and all were on.

However I noticed the light in the garage was dim and when I turned off the specific breaker to the foyer where the thermostat was located the light became bright as normal.

Is the thermostat the problem or could it be another issue?

Thank you for your time and assistance.

Ron

It's really hard to say. Could it be another issue? Yes but it could also be the thermostat.

This question may seem odd but have you checked the battery?

Also, what kind of lighting is in your garage, fluorescent or incandescent?

To complete this question, you were right, it seems the problem was worse. The power lines to my house were bad. Electric co fixed them and thermostat is fine. Thanks.

That's what I would have suggested. Your power lines.